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4iiii Precision Power Meter In-Depth Review

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It’s been about 8 months since 4iiii began shipping their Precision power meters to buyers, which is a small pod affixed to your crank arm.  When the company announced their entrance into the market in September 2014, they had planned to debut a self-installable option for both left and right legs.  However, both have been put on hold while they initially rolled out their first version where you send in your crank arms.

The main appeal to the 4iiii product is the low cost – from $399USD for the system, making it the cheapest direct force power meter on the market.

Now, as regular readers know – I first received a unit back in the spring, however, I had complications getting accurate power.  I then received a replacement with the same issues.  Ultimately, it would take nearly 6 months for 4iiii to sort out why my specific pedaling style was causing accuracy issues, which they’ve now solved.  For many (perhaps most?) others, there were no such accuracy issues seen by then.  Nonetheless, during that time period, in lieu of a review, I updated all existing 4iiii posts with warning banners of the problem I was seeing.

All of which brings me to now – about two months after receiving what I’ll simply refer to as a Gen2 unit.  It looks nearly identical, but does contain updated firmware (which all previous units received), as well as some tweaks to the pod and installation process to address the issues I saw.

With that – let’s dive into things.  Oh, and yes, as always the trial unit will go back to 4iiii here shortly.

Unboxing:

First up is getting the crank out of the box.  Now keep in mind that the crank arm in my box will differ from the crank arm in your box, because you would have sent in your own crank arm.  So, this is after you’ve sent in your crank for attachment.  The way it works is that you buy the 4iiii Precision unit, and then as part of that you’ll ship your crank arm to them (they pay for shipping both ways).

So once it boomerangs back to you, you’ll be standing around with a nifty packaged up unit:

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From there, grab your nearest Ikea knife, and slice away:

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Inside you’ll find some paper goodness on top.  This would be a small manual, as well as information about your specific Precision unit.

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Additionally, you’ll find two stickers.

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Below all that you’ll find the crank arm all packaged up, as well two CR2032 batteries (thus giving you one spare).

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Now’s as good as any time to put the battery in.

Finally, here’s a closer look at the crank arm all undressed:

 

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The pod adds 6g of weight without the battery, and 9g of weight with the battery – to your crank arm.  In other words, basically nothing.  With that, let’s get onto installation and configuration.

Installation/Configuration:

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The installation of Precision is fairly straight forward – especially if you already removed your original crank arm.  If a buddy/shop did the removal of the crank arm, then you’ll likely want to return to them for their services, as you’ll need the same tools.  The exact tools will vary depending on the specific crank arm types and connection points.

In my case, things are relatively straightforward.  Here’s my starting point:

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From there, I’m simply going to attach the left crank arm onto the spindle:

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And then tighten it down per spec.  If you don’t know the exact torque requirements of your crank arm, I highly encourage you to look it up – as it can and will impact accuracy.  Simply go ask Mr. Google for your crank arm manual, it’s always listed in the first few pages.

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Once that’s all done, you’re ready to add pedals of your choice.

In my case, you’ll also see a magnet sensor on there – that’s simply because I use that to help validate cadence results coming from the 4iiii Precision (for testing).  There’s no need/reason to have a separate magnet sensor on the unit.

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With that – we’re done and ready to set the zero offset and ride (more on the zero offset in a moment).

(Note: The installation photos I took on the first unit I received, all other photos are from the second generation unit I received.  There’s zero difference between the two in terms of installation.  Just helping to clarify in case you see slight differences with respect to the other power meters on the bike at the time.)

General Use Overview:

When it launched, the Precision power meter was set to be a dual-leg system.  That meant it would have one sensor on each crank arm, similar in concept to Verve’s Infocrank, Garmin’s Vector, Pioneer power meter, and other two-leg capable system.  However, at this time, 4iiii is only shipping a single-leg system.  That single leg being the left crank arm, similar to the Stages power meter, among many others.

Now, I’ll talk about their upcoming dual leg system later in the review, but for now – this is only a single leg system and this review is specifically for the single leg crank arm.

But what does that mean from a technical standpoint?  Well, at its most basic premise they simply double your left leg power.  Of course, most of us have two legs, both of which output power.  So for single left leg systems, they aren’t accounting for your right leg power individually.  Rather, that gets ignored.

This means if your legs have an imbalance (very much normal), your total accuracy might be more variable.  Further, it’s very normal for people to be variably balanced depending on intensity or fatigue.  For example, I tend to be generally balanced up to about 315w (my FTP), but then beyond that, I become rather imbalanced.  In the event that my left leg is weaker, that means my total power is being undercut on a Precision system.  Whereas if left leg was stronger, my total power would be overstated. I’ll talk more about this later in the accuracy section – but I think it’s important to understand from the get-go.

Of course, all of this left-only stuff is most easily seen in that there’s only a single pod on a single crank arm, as seen below:

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This pod is effectively non-removable.  While you can remove it from your crank arm, once you’ve done so you’ve ‘destroyed’ the pod.  So think of it as a long-term thing.  For those curious, this would be no different than the Pioneer system, Stages or others.  It’s not designed to transfer from crank arm to crank arm.

The pod runs on a single CR2032 battery, which 4iiii currently says gets about 120 hours of battery life.  That’s up from where it was this spring and summer, where users were getting far less than that.  Firmware updates since then have improved things significantly.  CR2032 batteries are cheap, so even if you’re getting slightly less battery life, you can always buy a pack of 20 them for $7 on Amazon (those are the exact ones I use).

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The one area I’m not super thrilled with is the battery cap, which I found can somewhat easily bend it’s slot-system.  It’s not the end of the world, since it’s just the cap part I’m annoyed with, and I haven’t seen any indications it’s causing pod leakage issues (ala Stages Gen1 units).  Still, I’m hoping they’ll improve it down the road.

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The 4iiii Precision broadcasts data on both ANT+ and Bluetooth Smart.  While doing this it’ll broadcast your current power & cadence on ANT+, and your current power & cadence on Bluetooth Smart.  Both of which use the standard power meter device profiles on both protocols.

In addition, 4iiii recently released a firmware update which enables Torque Effectiveness & Pedal Smoothness on the Precision system.  However, this firmware update will only be freely available for purchasers of Precision prior to January 15th, 2016.  After that, it sounding like you’d have to pay to get such capabilities.  To be honest, those metrics aren’t probably super-useful in a single-leg configuration.  But to each their own.

If pairing via ANT+, you’ll be able to search and find the 4iiii Precision system via any ANT+ capable power meter head unit.  It’ll then display the ANT+ ID as part of that process.

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You can dive in to get additional information such as battery status.  In the case of Precision, setting a crank length value is not required or utilized – so there’s no reason/need to do so.

On the Bluetooth Smart side, I’ve successfully paired it to a Polar M450, and received data from that successfully as well.

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You’ll also use Bluetooth Smart to update the firmware on the 4iiii Precision, using the 4iiii app.  This app is also used for other 4iiii products, such as Viiiiva and the original 4iiiii Heads Up Display.  In our case though, we’re just going to use it to update/configure our Precision:

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When you search/scan for it and connect to it, it’ll immediately notify you that a firmware update is available.  It’ll then give you details about it:

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The firmware update takes less than 60 seconds to complete – so it’s pretty painless.

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You can also use the app to complete a zero offset:

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Speaking of which, before you head out, you should perform a zero offset on the Precision power meter.  Like many power meter companies, 4iiii recommends doing this before each ride, from their manual:

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This can be done from the app, or from your head unit.  If using a head unit, you’ll dive into the calibrate option:

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You’ll want to align the crank arms as such, per the manual.  Once it finishes, it’ll provide you two offset numbers, so if you’re recording those, you’ll want to validate you gather both of them.  The first number should be between 8,000 and 11,000, and the second number between 18,000 and 21,000.

In the event your crank arm is out of alignment per the manual, it’ll notify you that calibration has failed, so just check the orientation and try again.  All pretty easy and straightforward.

Once out riding, the unit will display your current power and instant power just like any other power meter.  Like most power meters, it’s usually best to configure one of your data metrics for a ‘smoothed’ power meter value, such as a 3-second (3s) or 10-second (10s) power value, as it helps to reduce some of the variability that is totally normal for power meters.

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Note that the 4iiii Precision single-leg system will NOT display power balance, as it’s not measuring your left/right legs independently.  Down the road when they enable a full dual-leg system, that would be a feature of that two-part system.

Finally, I noted earlier that I’m on a Gen2 unit.  That isn’t technically their terminology, though, it’s as close as you’ll get to it.  It means that basically there are some minor hardware tweaks that came about in the September-October timeframe, along with updated firmware.  That firmware is the same as those on Gen1 units.  The main difference was that for me, for my ‘pedaling style’, it apparently caused accuracy issues on Gen1 issues.  What is my ‘pedaling style’?  Well, according to 4iiii, their explanation is as follows (in response to a reader comment a while back):

“As a bit of background, the majority of people pedal in a generally circular motion and receive accurate PRECISION values. For most of us, the crank arm and pedal cause our legs to travel in circles, but a small percentage of cyclists exert unusual forces on the pedals. This is what was happening with Ray. Anyone exhibiting an unusual pedaling style and wanting to compare power data with other meters, will benefit by the firmware upgrade…

…We understand Ray’s quirks – things like Left/Right imbalance, pronation on the pedal (EG: turning your foot in the bracket), leaning on the inside or outside of the pedal and numerous other forces and torques applied. The Precision power meter is unique in that it understands more than just simple bending with an approximate calibration. A real crank arm cannot be accurately approximated by this method for true torque sensing. Further refinement to the build process rectified an issue affecting a limited number of crank models for a small percentage of riding styles. It has been our very unfortunate learning experience that the crank model sent to Ray combined with his style was in that category. Only one person of all the 4iiii’s personnel has been able to present with similar magnitude of error.”

As for how 4iiii reconciles this for existing owners, well…I’m not sure entirely to be honest.  I suspect if you’re experiencing accuracy issues, they’ll take care of you.  But how you’d know you’re having accuracy issues if you don’t have another power meter (or two) for comparison is certainly rather tricky.

Power Meter Accuracy Results:

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For my testing period, I used three different 4iiii Precision units (two Gen1 units, and one Gen2 unit), all of which were installed on my triathlon bike, a Cervelo P3C.  Though, all my bikes are configured somewhat similar in terms of testing/validation units, normally with 3-4 power meters in total.

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In the case of these tests, the following configuration was used:

A) 4iiii Precision crank-based (left-arm only)
B) PowerTap G3 wheel hub
C) PowerTap P1 pedals
D) PowerTap C1 chainring unit

For indoor tests, I’d usually place it onto a trainer that supported rear wheel usage (generally the CompuTrainer, so I could keep the PowerTap hub on the bike).

From a data collection standpoint, virtually all of the data used in the analysis was collected using Garmin Edge 510/520/810/1000 units, as well as limited M450 usage.  I also recorded some data with NPE WASP units, as well as other applications.  Data analysis is largely done in a custom toolset I use to ferret out differences, while also using more widely available tools like Golden Cheetah, Excel and Training Peaks to validate the results.

Just to set a baseline, the 4iiii Precision has a claimed accuracy range of 0w to 4,000w, at +/- 1%.  Further, it has a claimed cadence range of 10-170RPM.  Remember that the accuracy range is of the left-leg, which can be more variable if you compare it against a left/right system since it’s not capturing the right leg power holistically.

With that, let’s dive into things.  I’m going to pick a few random rides that talk to specific conditions (i.e. temperature changes), sprints, stable power, trainer, etc…  The goal being to find out any oddities that I might see.  You can download all the ride data used in this review at the end of this section (plus a bunch of other random data I tossed in there not shown here in graphs).

(Note: You can also find a few more data points in my PowerTap C1 In-Depth Review, where the 4iiii Precision system was included in various data sets as well.  These two reviews show two different sets of data.)

First up is a ride from last week, where I headed over to a local park and did loops there.  As part of each loop I did a sprint up the hill on the loop.

What you see below is a non-smoothed look at that ride.  Regular readers know that I always show this first, just to show how useless it is in analyzing data.  This chart actually shows four different power meters plotted on the same graph.

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Instead, I prefer looking at smoothed data, which helps us to easily spot where things get misaligned.  In this case, I’ve applied a 30-second smoothing to the exact same chart as above, giving us the below.

In the right hand corner is the key to the different colors.  The wattages you see next to it are merely the single points in time where my mouse is, it’s not showing averages.

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So why not show averages?  Well, they can be sorta-interesting, but also super-deceiving.  A power meter can be ‘wrong’ 100% of the time, yet still actually be correct for an average.  It’s the easiest bar to pass.  I’ve demonstrated numerous times that simple $99 power solutions like the PowerCal can be very close using averages.

Nonetheless, for those curious, here’s the various averages and maximums from that ride:

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The problem with looking at stats like 1-second power, is that it gets to the nuances of how power meters and head units talk to each other.

For fun, I’ve picked a section of the previously noted chart and zoomed in on it.  I’ve also reduced the smoothing to 10s (giving more variability).  In this case, it’s my first sprint of the night.  You can see that all four power meters track very closely both pre-sprint at steady-state (approx. 300w), and then into the sprint (approx. 700w).  Generally speaking pre/post sprint they were within 10w of each other.  And then during the sprint, that grew slightly to a max spread of 31w.

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But there’s a catch – which is that the above chart makes some incorrect assumptions.  Specifically, it’s not actually comparing ‘like to like’.  In the case of Precision, it’s technically incorrect to compare it to a PowerTap G3 or the P1, or the C1 units.  Why?  Because those are all measuring my left/right leg totals.  Whereas the Precision (like Stages) is just measuring my left side.  So in the above case, the Precision measured ‘high’ at my sprint peak.

What if instead we just compared the left-only reading from the PowerTap P1 pedal, to that of the left-only reading of the Precision?  Ask and you shall receive:

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So what do you see above?  Well, just the left-leg power.  We see that the P1 is slightly higher than the Precision, which is logical (it’s closer to your leg).  We see the two agree on max power – being within 2w of each other (0.6% difference).  Whereas at lower wattages, it’s in the 5-8w range.

I picked another sprint later on, here’s the difference there.

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It’s actually interesting – I think this is the first time anyone has ever shown comparing one-leg portions in a power meter review.  Given the bike at the time only has two left-only capable units, it’s impossible to know which one is truly correct.  Once I add the WatTeam left/right capable system to the bike here shortly, I may be able to narrow it down.  But we’re really at the point of splitting hairs.

Moving onto another ride…

Here’s the 30s smoothed version of this one.  Quite frankly, things look really darn pretty at the 30,000ft level:

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So let’s dive into some of the peak power, and reduce the smoothing to 5s:

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Woah – so in this case Precision for this sprint is showing 50w higher than the others.  So let’s investigate. What does the left-only data say about that?

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It shows a difference of about 12w, and then grows slightly to 21w.  Again, there’s no way to know which one of these is correct.  It could be the P1 or the Precision (or somewhere half-way in between).

Now this is where we can start to see some of the impact of left-only, when I apply a Mean-Max graph, which plots max wattages over various timeframes.  You’ll see that up through about 600w @ 30s, things align beautifully, but after that it appears that my left leg was slightly stronger during the sprint – causing some higher values once doubled.  To be clear, this isn’t a negative mark on the technical accuracy of Precision, but just the reality of doubling left-leg power.

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Finally, a quick look at cadence on that ride.  You’ll see things largely matched quite well.  There’s one blip on the PowerTap G3 around 1/3rd the way through – but that’s estimated cadence, and there’s nuances that can cause those blips.  Also, don’t overthink slight differences in cadence when you stop/start pedaling.  That’s really an artifact of the way each power meter and associated head unit handles that split-second where the pedals stop moving.

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The above ride is interesting, as it included numerous cobbles sections, as circled on the map below.  Cobbles can cause cadence ‘issues’ or variances – which we don’t see above.

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Finally, one last quick one before we wrap-up.  This one on an indoor trainer (note: I’ve snipped off the end of the workout where there was some interference in some data sets).

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I’ve included this one for fun, merely to point out what happens when I do left/right leg drills.  You can see there that when I’m pedaling with only my right leg, the 4iiii Precision will drop-out entirely (as expected, since no load is going through the left crank arm).  Meanwhile, when I pedal with just my left leg – it doubles it and shows twice as much power (an artifact of the business as usual doubling of the left leg).

Beyond that, the units all track fairly well – including through the 30/30’s, though Precision is a touch bit lower.  In taking a look at the left-only track of the P1, sure enough it’s also lower, indicating that for whatever reason that night my left leg was less powerful.  Interestingly – this somewhat matches what I observed back when I looked at this when Stages first came out.  In that I’ve seen slight variations between indoor and outdoor rides in terms of balance between my legs.

In any case, I’m not seeing anything that’s of concern when it comes to the accuracy of the 4iiii Precision units at this point, with current firmware/hardware – everything tracks very well and without issue.

(Here’s a link to all my 4iiii Precision review data, including all comparative sets.)

A Brief Look at Precision Dual Sensor Systems:

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Back in October I took a look at the upcoming Precision Dual Sensor.  It was a simple (and rather short) test ride, mostly to validate it exists, and how well it tracked against a few other power meters.

You can find details on that in this post here, which talked through everything from the basics to the data on the test ride.

My review here (the one you’re reading) is focused exclusively on the single-leg unit.  Once the ‘other half’ of the system, the right leg, starts shipping – then I’ll likely release/do a new review focused on the full left/right system.  The expectation is that such a system will be simply a case of adding the drive-side crank setup to the existing left-only crank arm.  Thereby allowing for easy upgrades.

4iiii has not released a timeframe for when that’ll occur, thus, I don’t have a dual-leg system at this time and am therefore not working on a review currently for such a system…because again, I don’t have it yet.

Power Meter Recommendations:

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Note that while this is a power meter review, I tend not to put purchasing recommendations/comparisons to the rest of the market in these.  The reason being simply that I’ve created an entire post dedicated to that – with boat loads of information about all the options available on the market.

Now – what about comparing between the different left-only options?  Well, at a high level I’d focus on compatibility first.  Eliminate those crank arms that won’t mate with your bike (or your crank arm religious beliefs).  All of the various left-only units have nuances in terms of compatibilities, so that’s the first step.  The next is looking at price.  Right now, the 4iiii Precision is the least expensive out there (simple fact), with Stages closely behind it at about a $129 premium.  Finally, consider whether you plan to upgrade to a dual-sensor system down the road.  If that’s the case, you’d want to narrow down to: 4iiii, Pioneer, Garmin, Polar, bePRO.  All of which offer currently shipping options that allow you to ‘upgrade’ to a dual-left/right system down the road.  But, let’s not get so far ahead of ourselves, read the buyer’s guide post first.

So grab a cup of your favorite caffeinated beverage and swing on over to that guide for more than you ever wanted to know.

Summary:

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There are so many variables and parameters to consider when choosing a power meter.  I’ve discussed all of those in the aforementioned buyer’s guide.

That said, once you have narrowed down your selections, the current 4iiii Precision is a solid left-only option.  I’m especially interested to see how things look once they layer in the right-side of the equation next year.  If they can maintain the same level of accuracy they have now, and still hit the same price ranges as previously advertised ($749), it’ll be one of the cheaper full left-right capable options (with only WatTeam being cheaper).

Until then, it takes the KOM for the least expensive direct force power meter on the market – and one that’s just as accurate and easy to use as ones that cost significantly more.

Found this review useful?  Or just wanna save 10%?  Read on!

Hopefully you found this review useful.  At the end of the day, I’m an athlete just like you looking for the most detail possible on a new purchase – so my review is written from the standpoint of how I used the device.  The reviews generally take a lot of hours to put together, so it’s a fair bit of work (and labor of love).  As you probably noticed by looking below, I also take time to answer all the questions posted in the comments – and there’s quite a bit of detail in there as well.

I’ve partnered with Clever Training to offer all DC Rainmaker readers an exclusive 10% discount across the board on all products (except clearance items).  You can pickup the 4iiii Precision from Clever Training. Then receive 10% off of everything in your cart by adding code DCR10BTF at checkout.  By doing so, you not only support the site (and all the work I do here) – but you also get a sweet discount. And, since this item is more than $75, you get free US shipping as well.

4iiii Precision Power Meter

Thanks for reading!  And as always, feel free to post comments or questions in the comments section below, I’ll be happy to try and answer them as quickly as possible.  And lastly, if you felt this review was useful – I always appreciate feedback in the comments below.  Thanks!

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374 Comments

  1. Brandan K.

    Did you do any testing with this unit and the Garmin Fenix 3? I’m curious how reliably it communicates with wrist worn units. Thanks!

    • A little bit with the FR920XT and Epix, but I don’t think I have any Fenix3 data. I didn’t see any issues, but my testing with wrist units wasn’t as wide as my testing with Edge units.

    • Brandan K.

      Thanks Ray. I believe the Fenix 3 and the 920xt share the same ANT+ antenna, so my guess is that they would function similarly. I sold my Stages unit since I was not able to get it to communicate reliably with my 920xt or my Fenix 3. Perhaps 4iiii has better signal strength from their pod. I think it might be worth trying.

    • Hi Brandan. You shouldn’t have any problems with a Fenix 3.

  2. Patrick

    Don’t forget to attach the pre-load cap before tightening those two bolts on the crank arm!

    Thanks for another awesome review!

  3. rjdennis

    any news on the self install option?

  4. Simen

    Great review! Thanks.

    I’m debating wheter I should buy a power meter or not, and this seems like a great option for a reasonable price. However, I wish I did not have to send my crank arm in. Shipping from Europe to USA for installation and then back would take weeks.

    And Ray, did you do any testing in the rain? How much rain can it handle? Do I need to be careful when washing my bike?

  5. Gergely Szatmari

    Hi Ray!
    Did, will you have time to test the powermeter with Polar V800?

    • No, I didn’t.

      Just as a bit of background, part of the challenge I have with testing multiple BLE devices is that it’s basically one device per ride, since the max concurrent connection on BLE is one. That said, I’ll make a game-time decision for tomorrow’s ride and do it either on V800 or V650.

    • Garry Curley

      That would be great!

      Cheers Ray

  6. Toni

    Hi Ray – are there any access issues with changing the battery? Presumably you can do it easily enough without having to take the crank arm off every time?

    • Richard W

      Toni, It takes about 20 seconds to change batteries. I have a gen 1 usnit and all you have to do is twist the cap about 1/2 cm from “locked” to “unlocked,” pop out the the old battery , put in the new and twist the cap back on. Finis!

  7. How does it compare to the Limits… ;)

  8. M Velo

    Hi Ray,

    Is the 4iiii Precision Power Meter compatible with 2013 Madone frameset?

    I am well aware that a power meter like stages won’t run on the Madone unless I replace the Shimano rear brake with the Bontrager. But the size of the 4iiii precision power meter makes me a little curious and it would be great if you could throw some light on this case.

    • Drop us an email to support@4iiii.com. We’ve managed to fit a a few Madones so far. It depends on a few variables though.

    • S. Smith

      One of the reasons I chose the 4iiii was due to nearly zero clearance between my DA crank arm and the Trek Emonda SLR chainstay (Stages didn’t have a chance). Being able to specify the 4iiii location (to some degree) on the crank arm saved the day.

    • M Velo

      Hi Karel,

      The issue is the brakes which are installed underneath the Bottom bracket and not with Frame.

      Were those bikes(Madone) equipped with Shimano Brakes or with the Bontrager brakes?

      I will be using a 7900 crank arm if I plan to purchase your power meter.

    • We’ve installed with the Shimano brakes before. The 7900 crank arm complicates things though – due to it’s shape we have less latitude with the installation location.

  9. Sam

    Was waiting on a final review, with that I just purchased using the code, thanks!

  10. Hide

    Now only for the Canadian dollar to improve – shame it’s a Canadian company and ships from Alberta… At least there will be no import fees

    • Lee

      Ya, I was hoping there would be some kind of break for Canadian customers ($399 Canadian) Dollar took a turn and it’s starts making these reasonably priced power meters expensive again.

    • Roman

      The fact that Canadian company does not offer Canadian dollar priced product is putting off my buying this power meter.

    • Lee

      This bothered me as well since the dollar is at 1.4.

    • Rob

      I have to echo these concerns. Really disappointed the company won’t help out its Canadian support base by taking into consideration our dollar. To me it represents an opportunity for them to gather some momentum here in Canada as most are reluctant to buy anything from the states these days.

    • Lee

      I ended up purchasing mid December, not paying attention to much to the exchange rate. Even after receiving a 10% discount my final cost was $597 Canadian. Last year with the exchange it would have been about $450.

    • Support 4iiii Innovations

      Our order screen allows you to select your currency so you can see the price at the current exchange rate. As we primarily operate in a global market, we are maintaining the single price structure in US currency.

  11. Tosin

    So, I’m assuming once it’s on, it’s not coming off? So if you are changing bikes in the future, you either sell it with the bike, or you keep the drivetrain?

  12. Dan Vu Quoc

    The literature for precision and your old article used to mention temperature compensation, do they just simply not have this anymore?

    • PRECISION was designed to maintain a high level of accuracy across a range of temperatures. Should we find that additional compensation mechanisms are necessary, we will address that need through a future firmware revision. We continue to recommend that riders re-zero PRECISION before every ride.

  13. Dan Morley

    I have had no dropouts from my Precision to my wrist worn or bar mounted Garmin 920XT,

    I have updated my Precision to the newest firmware but my Precision readings are still around 30 watt (AVG and NP) less than my Kickr reads. I have no other PM to compare it to. I guess the only option is to apply an offset to the Precision. I thought the readings would be closer.

    Ray, do you ever compare PM reading to Kickr readings?

  14. Chris

    Are the newer units different from those made earlier this year? Was lead to believe that the change for your pedaling style was strictly firmware change and not hardware. Would love to here from Karel of 4iii on this. Like you said if you only have one power meter how do you know if you have an accuracy problem.

    • If you only have one power meter why do you care? The number is irrelevant as long as it consistently goes up and down for the same inputs. If you’re using the same device to train and race then the exact wattage makes no difference whatsoever. if your peak is 100 then 50% of that is 50. If your peak is 400 then 50% of that is 200. This means that whatever the number you can work out your zones and FTP, and because you can do those things the power meter will fulfil its destiny.

      If you get wildly fluctuating readings for the same input then that’s a huge problem of course.

      That’s assuming you’re using it to train and/or race of course. Data collection for geeky reasons is a different matter, but then that would put you in the same box as Ray and you should have at least 17 power meters to test and compare with :)

    • The problem becomes that someday (whether next year or three years from now), you go out and upgrade your power meter to something new. At that point, all past power data gets thrown out the window, because it’s not accurate (potentially by a lot – like 10-20% in my case).

      And because technology is technology, there’s virtually no scenario where down the road you won’t upgrade to something new – hence why it’s so important to be accurate.

    • Very good point Ray, hadn’t thought of that. The next question though, is if there was something available for silly cheap that measured power consistently but with different numbers could you ignore it then? I was thinking this with the power meter box company (they proved they have a box…). Even if it’s rubbish, at the price consistency would still allow it to be a useful training tool. As you say, eventually you’d have to bin the data but I think I’d be OK with that as a trade off to keep $1000 in the mean time. Then I’d go on forums and moan about accuracy :)

    • The difference between Ray’s original units and the one he has now is a combination of firmware and installation method. The hardware in Ray’s new crank is the same as the others, but we’ve made some changes in our manufacturing process that remove style dependencies. First generation PRECISION units have the potential to exhibit similar behaviour to Ray’s original PRECISION based on your riding style. We have found this riding style to exist in a very small subset of riders. Those with a second power meter, who know approximately what the difference is between it and their PRECISION are invited to use the scale factor feature that we included with the latest firmware release. The intent of this feature was to allow customers with known L/R leg imbalances to correct for them, but the feature can also be used to align PRECISION with your other training tools so that you can transition seamlessly between them.

    • Stephane D

      Hello Karel, Hi Ray and many thanks for your work.
      The scale factor is a very interesting feature, which could influence my choice for a second powermeter.
      To align PRECISION along with a powertap, one use the smartphone 4iiii app.
      I’m wondering if the aligned power numbers are only computed by the 4iiii app, or if they also could be read by an other head unit (like garmin 920xt).
      Thank you.

    • Hi Stephane,

      You set the scale factor with our app, but then the adjusted values are transmitted by Bluetooth and ANT+ from the power meter, so you can receive them with the head unit or app of your choice.

      Yours,
      Karel

    • Stephane D

      Hi Karel,
      Thank you for the explanation. Very good feature.
      Kind regards

  15. Oscar

    Can I just say I am in total awe of how clean your bike’s frame is, considering it’s mileage and color. I guess I should do a total teardown/clean of my white bike on the weekend now.

    • portemat

      My thoughts exactly!
      Not sure if it is a good thing, that after reading the review all I can think of is “how clean is that bike?!”

      I think we get spoilt here, and a high quality review is expected, so we end up looking for something else!!

    • Trust me, it’s an optical illusion. The white frame looks like crap in person. But with photos, the whites ‘blow out’ the picture, so you can’t see the scratches/marks on it.

      I’ll never purchase another white frame.

    • Gunnar

      That white Cervelo is to Ray like a Hofner Bass is to Paul McCartney or a cane to Charlie Chaplin. He can never get rid of it.

  16. Adam B.

    Thanks for the review. Is there a general turn-around time on getting your crank arm back in the US?

    • John

      Once the arrangements were made, it took me a week from when I dropped the package off at the FedEx office until I had it back in my hands. The 4iiii’s folks were awesome.

  17. Alex

    You stated in this review that it makes sense that the P1 pedals were higher than the 4iii because it’s closer to the source of power (your legs). But on one of the charts above the PowerTap G3 had the highest average!

    • Welcome to the fun world of power meter testing. The more I do it, the more variances you see. I always find it funny when certain groups of folks vehemently argue over the accuracy of just a few watts. Seriously, if ones knew how much their power meters differed week after week (all brands, yes, including SRM), they’d probably be amazed and give up.

  18. Mark

    Any time frame on compatibility with carbon crank arms(ie Sram Red)?

  19. Lumanz

    I’m really happy with my Precision, reliable and constant. Looking forward to the other half. Maybe a discount for the early adopters? Or a discount on the crankset when buying from 4iiii wound be nice!

  20. FJ

    Like, really like it, but I’ll wait for the dual sided version

    To 4iiii, if you do manage to get the dual sided option for $750 and it proves accurate and reliable, you’ll be in the running for my next power meter. As of today, the only candidate is Power2Max, for the simple reason that it’s solid, reliable, and keenly priced (wish I could say the same about my powertap)

  21. Stephen Spall

    Have had the unit since July and very pleased with its performance, no issues and seems to be consistent. The review above would have benefitted with a comparison with the Stages Left only power meter as I suspect potentially buyers coming in at the lower price point would view these 2 as the main options?

    • Seth

      Don’t think it would have been possible to compare this to Stages as the stages is measured from a dedicated left crank arm while so is the Precision. From what I can tell, you can’t run a Stages and a 4iii Precision at the same time.

    • Correct, they occupy the same space on a crank.

      From a technical standpoint, they’re pretty much identical. There are some minor feature nuances, but those tiny differences between the two are actually two features that I believe are useless on a left-only crank.

      A) Stages has high-speed data analysis: Realistically, at high-sprint levels, we’ve seen so much left/right inbalance that this number isn’t terribly useful.
      B) Meanwhile, 4iiii has Torque Effectiveness & Pedal Smoothness: Which, like Stages is somewhat useless as a left only metric.

      Beyond that, they both have dual ANT+/BLE. Really, it’s going to come down to crank compatibility (which Stages has a slight edge on with now carbon), as well as price (which 4iiii has an edge on).

      In other words, it’s all kinda a wash technically.

  22. Thomas Bunge

    Hello DC,
    I’ve been waiting for this post for a long time. The 4iiii solution seems to be ideal for me and I even was in contact already with Karel from 4 iiii support….BUT, and that’s my biggest concern, Karel wrote me, that if I wanna buy the system, I would have to send them my crank to get it modified. I’m using my bike quiet often and I can’t wait weeks to get back my crank. Not to talk about shipping costs to Canada and back. Any ideas/words on that?

    • Julian Simpson

      Someone above mentioned that Precision is actually in Canada (Alberta)

    • Julian Simpson

      Sorry I misread your comment and assumed you were in Canada.

      That said someone above said it took about a week from the US to send and receive their crank including installation.

    • Thomas Bunge

      No, I’m from Germany. Sorry, didn’t see the post you are mentioning.Shipping to Canada and back is insane expensive, so I’ll have to check on that.

    • FJ

      Check with 4iiii. I think they may have an office in Frankfurt. One of my riding buddies was working there for them, although not any more and I’m not sure if they just closed the office or he decided to move on

    • Hey I’m from Germany and we had no problems ordering from here .
      They sent you a simple box and all you have to do is to carry it to the post office. done.

    • Thomas Bunge

      @Alexander, can you send me a PM about the process, costs, customs etc., please? Thanks (bungee13@web.de)

  23. andrew

    Well, this is very vain, but why do they leave the wings on the unit once it is attached to the crank? The unit cannot be removed and then put on another crank, so once installed their utility is gone. However, they just look awkward. In fact, they look so awkward that I would almost consider the Stages Cannondale SiSL instead of the 4iiii just because it has such a cleaner look.

    Is there any reason why one could / should not file down or shave off the wings once installed? Could it hurt the performance or accuracy of the unit?

    • Steven Shaw

      I wondered the same about the wings. Would there would be an issue if you took a Dremmel to them?

      This has now become the powermeter that interests me most. Only trouble is I live in the UK. I think I will hang on for news for a self install.

    • Carl

      I had the same thought before I got mine, but I never notice them.

    • Daniel G

      Stages doesn’t put a power meter on the SISL nor the SISL2, only the SI. So if you’re vain enough to care about the wings on the Precision unit, you probably also care about the crank saying “SI” vs “SISL” or “SISL2”. Vanity aside, you might also care about the differences in material & construction of the SI vs your SISL, if any.

  24. Michael

    Hi Ray,

    Thanks for the (as usual) great review. I’ve noticed that both this and your Infocrank review your accuracy results compare to a suite of PowerTap products. Any concern that it’s potentially “not fair” to have most of the comparison units come from the same manufacturer? My thinking is just that PowerTap probably uses similar testing/calibration/QA/etc processes across their product line, making them more likely 1) agree and 2) react similarly to variable conditions. I know you have good reasons for selecting each of these PMs (the G3 is the only hub-based unit, you like the P1’s better than Vector/bePRO for general use, Quarq/P2M aren’t compatible with Shimano crankarms, etc..), and that each have been tested thoroughly, but it seems like variety could be beneficial (and hopefully not too much more work for you?).

    • I’m constantly mixing and matching power meters, so while this was a random case of having 3 PT units vs one 1 4iiii unit, there’s many cases of 2PT vs 2 others, and so on.

      In this case, the test was merely a cause/effect of working on both reviews at once. And, due to process of bottom bracket and crank elimination, it’s just the combo I came up with. The following factors resulted in that:

      A) My Quarq are 175mm, and uses a different BB standard, the 4iiii unit was 172.5 – you can’t mix non-Vector units and get a scale factor option to correct lengths (which would impact roughly 2%)
      B) I couldn’t use the Verve Infocrank, since that’s a self-contained system and isn’t compatible with 4iiii
      C) I couldn’t use a Pioneer, for the same reasons as Verve.
      D) I could have used Vector2 instead of the P1’s, but that’s such a pain in the ass, especially as I was moving pedals around between two bikes for other tests.
      E) The bolt pattern of the C1 didn’t match my other units/wasn’t compatible
      F) The bePRO was on another bike and headed back to them.
      G) Power2Max was setup for ROTOR cranks, which aren’t 4iiii compatible.

      All that said, I’m always mixing and matching. Come this weekend I’ll be ‘re-stacking’ that bike a bit, deciding exactly on how I’ll mix it up for tests from Christmas forward, roughly it’ll probably be:

      A) Wheel: PowerTap G3 Hub
      B) Pedals: Likely P1, but may swap in Vector2 for a short bit
      C) Crank Spider: Might buy the Quarq RIKEN AL (need non-carbon for WatTeam)
      D) Left Crank Arm: 4iiii Precision or Stages
      E) Crank Arm Pods: WatTeam
      F) Other: PowerPod

      The challenge is setting up such a bike requires a fair bit of validation on all the pieces, such as bottom brackets, carbon aspects, crank lengths, etc… to make it all match.

  25. Emmanu

    Hi,
    Does it match in bluetooth with suunto ambit 3 peak ?
    Tx for answer (&the review)

  26. Maureen O'Connor

    Can you tell me when the Garmin Forerunner 235 GPS watch will be available? Garmin can’t give me any info other than it is “top secret”! It is my husband’s Christmas gift! I’d hate to be empty gifting!

  27. Karl

    thank you for that review and partnering with Clever Training. So I could afford express international shipping to Austria without additional cost :-)

  28. Marvin

    Hi Ray,

    Any ideas if they will be selling in Europe? And if so when that will be.
    With the customs and all it’s for europeans better to go for stages money wise.

  29. Dale

    Looks from your picture of the dual sided 4iiii, there is a small pod nested in the chainrings. Is this how they plan to release the dual sided unit?

    I’m looking for a dual sided (actual, not estimated) power meter that doesn’t have any attachments to the chainrings so that I can easily clean the chainrings along with my chains and cogs. I don’t use Look pedals so P1 and Vector are out. I use Speedplay but doesn’t look like Brim Brothers is out yet and not sure if they would be compatible with my Tri shoes anyways. Watt team Powerbeat was the only one I found that does what I describe but I’m not so sure about their quality and the looks aren’t so good. The one I was hoping would work was 4iiii dual sided but if they have a pod nested in the chainring, it could be a dealbreaker for me. Any suggestions that match what I’m looking for? I went through your Power meter buyer guide 2015 but didn’t find one yet.

    • Being a prototype, things may well change on the pod style/design/placement – so do keep that in mind.

      Another one to check out on your list (which seems fairly complete) is bePRO, but that’s basically in the same boat as the P1.

      I’d agree that the best bet for you seems to be the WatTeam, once they release.

    • Hello Dale,

      Our right-sided power meters are not yet available and none of the details are finalized yet. On the prototype to which you’re referring, the visible piece is a battery compartment. The chainrings are still removable since there is nothing attached to them.

  30. Christopher

    Ray I am being told by 4iiii that the Garmin Edge 800 does not support the Torque Effectiveness or Pedal Smoothness metrics. Do you know or think that Garmin would add this in a firmware update at some point or are they done with updating an older model? Thanks

  31. Earnest Slusser

    Christmas is in the single digit days away. I’m still analyzing over the pros and cons of this and Stages.

    So…to help me, is the 10% discount still available and for how long?

    Thank you Much,

    Vince
    Roanoke, Va Tri Club member

  32. Aleksandr

    It would be great if they will sell crank arms with already mounted powermeter.
    I can`t even imagine how much time can it take to send my crank arm from Russia to USA and after a week of installing they will send it back. ~3 weeks or maybe a month without a bike…
    Their support says you can buy new crank arm and send it to us, this situation is better of course, but it is even more funny – anyway i`ll buy left crank arm in USA the seller will send it to russia, i will send it back to USA to 4iii, they will send it back again – Profit ).
    Cmon 4iii i can pay to you for the crank arm, buy it for me and install your powermeter and send it to me!
    Take my money !!!
    ;)

    • Not to worry, shipping and installation is relatively quick: 2-3 days shipping each way and 2-3 days installation so you wouln’t be without your bike for long. If you still want to get a crank from the USA you can have it sent directly to our factory in Canada for installation. Please contact support@4iiii.com and we will get this sorted out for you.

    • Aleksandr

      I send you email.
      But after it, i saw on your site, that i`ll pay 100$ for shipping from your site. it is 500$ with powermeter.
      link to i.imgur.com

      The link to clevertraining.com suggest 30$ shipping. So the total bill will be 390$ (with dcrainmaker discount code).

      link to i.imgur.com

      At this moment their price $110 lower, than yours. I do not lie, screenshots attached.

      So i think i`ll try to contact them too, maybe they can help, and i can order the crank for their address.

  33. Aleksandr

    Do not be shy to write questions to 4iiii support. They are always ready to help you.
    I`ve got so many questions about shipping, pricing, installing, payment and many other, I sent them tons of emails… They were so kind and so patient to answer all this stuff, which by the way was written on my bad English, so i can`t not to say about it here.

  34. T. Fuller

    I think this is an ideal set up for my son who is a Jr. racer at the age of 14. I’m not as interested in accuracy with him as I am with setting training parameters with him using power. Any thoughts or suggestions?

    • Hmm, honestly, I’d look at the PowerCal. It’s probably a great introduction to what power is, at a fraction of the price – especially if you’re not super-concerned about accuracy.

  35. JR

    What software are you using to make those compare charts?

  36. Joe

    Hi Ray,
    great review! I have two 4iiii units in use and I am pretty satisfied.
    The one thing I noticed is a drift on the calibration. In more detail, I checked in the bike at a long distance triathlon on Saturday and calibrated the unit just before. On race morning you obviously can’t go for a calibration ride again… In the race I saw a gap of about -30Watts to what I normally produce, taking into consideration my heart rate and RPE. Since I am quite an experienced rider I am pretty sure there was something wrong with the calibration. But I normally don’t stop in a race to fix electronic issue things….
    Have you seen anything similar, means any major differences in the 2 calibration parameters when you recalibrate or drifts?
    Best, Joe

    • Pearl

      Hello Joe

      Is this occurring with both your PRECISION units?
      It appears that you need to restore your factory calibration. Use the 4iiii app, connect to your PRECISION, go to the advanced settings screen and select restore. While you are in the app, please check that you have the latest firmware installed (0.3.0) and upgrade if required. Please send your zero offset values to support@4iiii.com.

  37. Karl

    I have sent it to 4iiii on December 18 from Austria and received it today with installed PM!

  38. Seth

    Been agonizing over whether to go with this PM or wait for the Watteam PowerBeat. However, in light of their newest delay and this glowing review; and the fact that I’m a relative beginner cycler, I’m thinking the Precision may be the way to go. Seems like I won’t be missing anything having only left leg data. Anything I’m missing or should be considering?

  39. Craig

    Interesting …. they are providing PrecisionPro units to Team Quickstep:
    link to 4iiii.com
    “Through a partnership with the team’s official equipment supplier, Specialized Bicycle Components, 4iiii is providing dual-sided PRECISION PRO power meters to the team’s more than 30 world-class riders.”

    but from their facebook page re: the press release:
    “PRECISION PRO is a pre-lease dual power meter based on the same core technology as PRECISION. We will post the dates for a dual power meter when a commercially available offering is formally announced. Right now, all we can say is that the dual power meter remains on our strategic road map.”

  40. Ted Thibault

    Your review of the 4iiii made my choice easy. Precision was very responsive in their turnaround time. The unit worked with one small issue. The cap that allows battery changes can be put on in two orientations, 180 degree turn. In one position the unit would not pair. Emailed Precision and got an immediate response and suggestions to correct the problem. Nothing seemed to work. So I suggested that they send me another cap. I would pay for it. Not only did they send me TWO caps but overnighted them to me via FedEx. I ended up shimming one side slightly and this has solved the problem. My point is if one is hesitant to order this product because of support issues, Id like to say that this is the best support I have ever received. Issues arises with any product. Its how a company responds that makes the difference. The 4iiii works! And I ordered it through Clever Training. Thanks Ray.

    • Karl

      I just can confirm the experiance from Ted! Every single email to the support team was answered latest next working day!

      I’m very confitent that i choosed the right PM

  41. Lee

    I agree with both. Every question whether via email or their Facebook page (via messenger) were answered within hours.

  42. seth

    What does one do about zeroing during a race? Do you just take care of it prior to the swim start?

  43. jay d

    I was intrigued by the review and price. But if a canadian company can’t support a canadian rider with some price adjustment…….

  44. Stephen

    OK, this may be a bit premature–there is some data I’m missing and will collect soon, but it’s the weekend and I thought I would post some questions/concern here in hopes that I might get some feedback before contacting 4iiii on Monday.

    I’m thiiiiisss close to purchasing my first power meter and after lots of research and going back and forth with various options, I was ready to pull the trigger on a Stages as the best value for me at this time. I had ruled out the Precision earlier in the process because I could find very little feedback about it’s actual use in the real world and I had a couple of less-than-optimal (but nothing serious) email exchanges quite some time ago when trying to get info on another 4iiii product. And, of course, Ray’s first experiences with the Precision didn’t bolster my confidence. I always thought the notion that Ray (of ALL PEOPLE) would have some kind of “unusual” pedaling style that would skew the accuracy of the power meter was kind of far-fetched. To be frank, I still think this is kind of weird, but Ray seems to be satisfied, so I’ll go with the flow on that.

    This current review has pretty much turned me around and now I’m ready to just go with the Precision, IF I can verify that it will, indeed, work on my bike. My main reasons are that the Precision is less expensive by enough to make it a better monetary value and, perhaps more importantly, it really looks like the option to add right-side measurements will happen sooner or later.

    So, with regards to compatibility: I have a 2015 Trek Domane with a Shimano 105 (5800/11-speed) group, EXCEPT for the crankset. Trek cheaped out and put an RS 500 crankset on the bike. When I researched this for compatibility with a Stages PM, I was assured by several different sources that I could buy a 105 5800, Ultegra 6800 or an Dura Ace 9000 crank arm from Stages and it would just bolt right onto the RS 5000 spindle. It has the same type “clamp” attachment and I was assured by Stages and other users who had successfully put the (mismatched) crank arm on the RS 500. So, I was going to get the Ultegra, put it on and then watch for a good sale on a full Ultegra 6800 crank and get everything matched up again.

    I want to do essentially the same thing with the Precision. I’ve been told by 4iiii (via email earlier today) that they have successfully fitted the Precision to Trek Domane’s in the past, but to be sure I need to do some tests, take some pictures and/or make some measurements and send to them to be sure. AND (bonus info!) 4iiii is now offering a Stages-like option to purchase the crank arm from them—so one-stop shopping makes this an even more appealing proposition.

    Before actually plunking down my $400 (less 10% at Clever Training????), I’d like to be as sure as I can that I’m not overlooking anything.

    Has anyone here done this install–to a Trek Domane with BB90 bottom bracket shell? From pictures I’ve seen and from others who have switched 105, 6800 left arms onto the RS 500 crank, it looks like, if anything the higher-lever arms would have even more clearance (i.e., be a bit slimmer) that the RS500. Per 4iiii’s videos, I’ve tried sliding an AAA battery (10mm diameter) between the crank arm and the seat stay/frame. It seems to make it to a point about the same as where the photographs of Precisions mounted to Shimano arms are, but I obviously need to be sure.

    One other question regards the app or device needed to do firmware updates. PLEASE don’t tell me you need an iOS device!

    Thanks in advance for any pointers, advice. It would be great if someone has already done this and can vouch for the process.

    STP

    • Pearl

      Hello Stephen

      You are not restricted to iOS. Our 4iiii app is designed for both Android and iOS.

    • Stephen

      Thanks, Pearl.

      Right after I posted the above a complete, super-low-mileage 6800 crank-set in the size I wanted showed up, so in a day or two I’ll have that available to send in.

      I’ll contact you via the 4iiii website with more detailed questions on how to best proceed–whether or not you can install the Precision from a set of measurements with the RS500 crank installed, or whether I’ll have to put the left arm from the Ultegra crank on the bike for pix and measurements. Any chance you guys have a template or measurements from previous Trek Domane + 6800 installs?

      STP

    • Pearl

      Hi Stephen

      We have installed on that combination many times. Normally we would request these clearance diagram be completed but I will forward you one of our completed installations for review when you place the order.

  45. Seth

    Just an FYI to anybody considering a purchase- they are backed up on installations. What I had expected of 1 week turnaround is looking like at least 2 weeks.

    • Philip

      Aren’t they just glueing the sensor to a crank arm overnight and shipping them back out? How do you get backed up 2 weeks?

    • They also do a bit of testing prior to sending it out.

      But either way, backups typically happen when order exceed workers to handle them. In most cases, those tend to work themselves back out again. It wouldn’t surprise me (given that comment was in late January), if that was a result of various holiday stuff from Decembe.r

    • Pearl

      Good news! Our manufacturing team is growing so we can fulfill your orders more quickly. We’ll be through our current backlog by the end of next week. Turn around time in the factory for a left side installation is five business days. When you place your order, select the shipping method that best meets your timeline. You can contact our sales order team for more information: sales@4iiii.com.

  46. Stephen

    I was ready to just go with Stages, and still think it’s a good choice, but when Ray’s in-depth review came out, I thought that the cheaper initial cost and the probability that a dual-sided upgrade will be available at some point warranted choosing the Precision.

    4iiii’s website is touting their sponsorship of the TdF Etixx/Quick-Step team (link to 4iiii.com ) so there is definitely a dual-sided version out there.

    Before ordering the Precision (through Clever Training, of course…) I checked with 4iiii’s customer support on when we might reasonable expect to hear something about the dual-sided upgrade. The response I got was that backward-compatibility has not yet been decided, so that’s a little disappointing, especially since dual-sided “upgrades” were always promoted by 4iiii itself. I understand that further development may have revealed technical difficulties in offering backward compatibility, and I don’t have any idea whether left side components being used on the Etixx/Quick Step units are the same as the ones being installed on consumer’s cranks. The Etixx/QS units are also installed on DA-9000 cranks, but they certainly look dimensionally identical to 6800, or even 5800 cranks to my eye….who knows?

    If there is any real possibility that units purchased now will not be upgrade-able, I’ll have to rethink and decide whether to just be happy with single-sided power to get started with, or re-consider something like the bePro or P1 pedals.

    Ray, please keep us posted if you can get any confirmation on this upgrade issue–one way or the other!

    STP

    I scored a very low-mileage Ultegra 6800 crankset from eBay and test-fitted to my bike and

    • Stephen

      Sorry for the dangling half-sentence in the post….wish there were a way to edit one’s comments!

      STP

    • Lee

      I sure hope it’s compatible! I wouldn’t have bought the left side only, knowing the right side would not work in conjunction with the left to make a dual side system.

    • Hmm…I hadn’t thought about it, but I think I may be able to turn on comment editing for registered users. Let me do some poking.

    • Stephen

      Ray,

      Thanks. Along the same line, is there any way to get the URL for a SPECIFIC comment so one could link to it when posting to other sites? Ever thought about hosting a set of forums as part of the site, using vBulletin–much more friendly for handling threaded discussions. But I realize that might be opening a whole ‘nother can of worms and there might not really be much in it for your site. I think you must be pushing WordPress to its max already with the complexity and amount of content you’ve produced. Much appreciated.

      Oh, and please see if you can get 4iiii to make a decision on the backward-compatibility issue. It’s stopped me dead in my tracks after finally arriving at a choice! I’m sure there are others out there who are EXPECTING a dual-sided upgrade who would or will be plenty steamed when they announce a dual-sided option that won’t work with early-adopters units.

      STP

    • Yup, to share a specific comment, just right click and copy the shortcut to a given timestamp in the comment (just below the commenters name). That ensures it always links back to that exact comment (even if the public comment number changes).

      I have looked at forums, but right now I think that’d be biting off more things to try and track and keep on top of (and I’d suspect that folks would naturally expect I’d monitor those too). Makes it tough.

    • Stephen

      Thanks, Ray. Got on getting a link to specific comments.

      Yeah, I think forums would probably be something of a dilution of “Ray-generated” content and I don’t know how you keep up with updating your own articles/posts let alone monitoring handling all the user questions and comments. And how you did all this before “retiring” is almost inconceivable.

      STP

  47. John

    Not sure that I’m digging those protrusions on both sides of the sensor, it almost looks like something designed to be attached with Garmin bands for universal mounts (though obviously that’s not the case here). I’m positive those would catch on some underbrush or small branches on my gravel bike in short order.

    One of the guys at gravelcyclist.com got pics of the dual-sided version being tested by Ettix Quick-Step, where the left side is sensor has a much lower profile (ala Stages), I think I’d be much more inclined to wait for that version:

  48. Bernd

    Oval Chainrings

    Hi Ray & Karel,

    I havent heard anything about oval chainring compatibility for some months and i´m wondering if there are some news. (I use the 10% ovals from Rotor, not those almost rectangular ones ;))
    Does anyone know if the new software can handle this?
    Additionally i would like to know if the resulting error is constant, if so, it may be possible to correct it by adjusting the l/r balance. I am not keen on perfect accuracy, i just want to know if i can get reliable data while using oval chainrings.

    Kind regards,
    Bernd

  49. seth

    Just updated the firmware this morning to 0.4 and now the unit will not connect or pair to either myphone or computer. It then prompted me to upgrade to 0.5 and it won’t connect long enough to do the upgrade. ANy ideas?

  50. Aaron

    Anyone ordered this through Clever Training? How does it work? Does CT handle the logistics, or will 4iii contact me to work out the logistics, or… ?
    Thanks!

    • Daniel

      CT will send the order to 4iiii on Tuesday (I believe). Then 4iiii will reach out to find out your crank model & bike info within a day or so. Or at least that’s what happened when I ordered a few weeks ago. I sent my crank arm in a week ago and am waiting to hear back from 4iiii.

    • seth

      That’s exaclty how it happened for me. I bought in January. I bought on a Friday night and 4iii reached out to me by Wednesday. I had the crank sent in by Friday. Installation took about 2 weeks (which was longer than expected).

    • Daniel

      4iiii is running a couple weeks slower now.

      Here’s my timeline:

      – 3/4 at midnight – Ordered through clevertraining
      – 3/9 received an email from 4iiii: We received your order from Clever Training. Please provide your crank model so I can advise you when we will be installing PRECISION on your left crank arm.
      – 3/9 a few hours later, received this email: Thank you for the information. Your installation is scheduled for the week of April 11.
      – 3/24 Received a fedex shipping label via email. I emailed 4iiii to ask if I should ship it in now or wait for 4/11. They said ship it now.
      – 3/27 (holiday Sunday) I dropped it off to local fedex, but it sat there for 20ish hours until the next pickup.
      – 3/29 tracking showed it was delivered ~ 11 AM

      That’s where my timeline ends, but I’m expecting to receive a return shipping # any day now. They estimated 3-4 business days in the ‘shipping your crank’ pdf they sent on 3/9.
      x
      Its cool they’re running ahead of schedule. But please note their website currently says “Order now and receive PRECISION in 2-3 weeks.”

    • Aaron

      Thanks for the info, folks!

      I’m going to order through CT.

    • Aaron

      Done! Can’t beat $359.99…

    • Thanks for the support Aaron (and Daniel & Seth)!

    • Aaron

      Happy to do it. Very much appreciate the work that goes into each of these reviews. I’m exhausted just reading through them :-)

      I’ve also started buying all my random stuff off of Amazon through your link. The monthly summary they send you is about to get… weird.

  51. Andrew

    I use an Ultegra 6800 crank connected to a bb30 via an adapter (WheelsMfg). Would this have any effect on the power meter? Very close to purchasing off Clever Training. Just making sure to dot my T’s and cross my I’s.

    • Hello Andrew,

      You’ll be fine with this setup, there should be no issues.

      Yours,
      Karel

    • Andrew

      Hi Karel,

      How does the order process typically work between 4iiii and Clever Training? It has been a week (ordered 04/05) and I haven’t received any correspondence. I understand this is probably a busy season for power meters, just poking for information.

    • Hi Andrew-

      Sorry, someone else had asked this, and I meant to loop back with a more detailed answer. Essentially Clever Training and 4iiii work in batches on a weekly basis, as it’s what they’ve found is the most streamlined manner. CT sends the batches to 4iiii every Tuesday, and then 4iiii takes it from there. I suspect that you might have just ordered a few hours after the batch e-mail occurred, so you’d be in today’s. Typically 4iiii then e-mails the buyer within 1-2 business days, and from there it’s just logistics of shipping cranks/labels/etc…

      Generally speaking, the entire process takes 2-3 weeks from the moment the purchase button is pressed until you’ve got the cranks back on your bike and are pedaling – depending on the queue at 4iiii’s.

      Thanks for the support!

    • Andrew

      Much appreciated. I figured it was something of that sort. Amazon Prime has killed off the ability to wait patiently for anything.

    • Aaron

      Andrew,
      I asked this question about 10 days ago.

      I ordered from Clever Training on Monday 4/4 and heard from Precision on Friday 4/8. Install is scheduled for “week of 4/18”.

  52. Richard noble

    Hi

    Has anyone had issues using the 4iiii in tough winter conditions, heavy rain, salt etc. Just wondering if there are any issues such as those on the stages power meter.

    • Lee

      I have commuted in some serious nasty weather and have had no issues. A few rides I was worried about how much water there was. Like a previous post, I opened it up after the ride and it was totally dry.

  53. Russ

    I’m confused about the crank arm length. I don’t see how to specify that on CT or the 4iii page. I see in one comment that yours is 172.5. Is that size fixed?

  54. Craig J Hoskin

    4iiii just announced deilvery in July for the dual sides
    link to 4iiii.com

    and analysis in 3d….
    link to 4iiii.com

    • Lee

      So from what I’m reading is the new 2.0 left only pod is $399 (sucks that I have the old one since January). The Dual side is $749 and only available for Dura-Ace at this point? I’m sure hoping they will offer an upgrade path for the original left side owners, but it concerns me that they now offer a new pod which makes me think the old pod will not be compatible up to dual side.

    • John

      Yeah, not really sure about the need for a Dura-Ace crankset exclusive, maybe that’s just a way to manage initial demand?

      I’ll be first in line with an Ultegra crankset when they get to them.

    • Craig Hoskin

      From Rays latest update:
      “Note that 4iiii is doing right by Gen1 customers wanting to upgrade to dual. In July you’ll send in your existing left crank arm (with the right crank too) and they’ll upgrade your old pod to Gen2, no extra cost.”

      link to dcrainmaker.com

    • John

      That some fantastic customer service!

  55. Elvin

    Hi Ray, your Mean Max Curve seems reveal that balance scale factor only needs to be adjusted in specific situation such as sprint. But as it is a constant factor, it will underestimate the rest input if you try to reduce the sprint output. I guess only double leg measurement can help here. I wonder how Stage dealing with this problem, or the pros doesn’t care about it?

    • Unfortunately for most people, left/right balance is not a constant factor. It usually varies based on wattage output, fatigue, even indoor vs outdoor.

      Stages, like 4iiii, simply doubles the left power. As for Pros, no, Team Sky didn’t care because they were getting paid not to care. Yet, these days they run a dual Stages system (left/right) that’s not available to the public (just like Team Etixx Quickstep does with 4iiii).

      Said differently: The pros have realized that capturing both left & right power is truly important to accurate measurements. ;)

  56. Michael

    I wonder if anyone was successful in using the Polar V650 with the 4iiii Precision.

    I got them paired/repairend on the 2nd attempt, but didn’t get any data displayed by the V650. Instead the V650 frequently notifies about a not responding left side power meter…

    • Hello Michael,

      Polar’s V650 is only compatible with some Bluetooth power meters. It would be best to check with them regarding compatibility.

      Yours,
      Karel
      4iiii Support

    • Davesee

      Michael–any luck with the V650? 4iiii’s website is saying it’s not compatible so curious what your experience has been since having this issue.

    • Michael

      The V650 definitely doesn’t work with the 4iiii PRECISION. I contacted the Polar headquarter in Finland and they confirmed that it isn’t compatible. Further on they weren’t able to give a date when the firmware will support it.
      I changed to the M450, which is compatible. And that the most strange thing about it. why isn’t Polar able to update the V650 when they already have the code available for the M450?

    • Davesee

      Very strange indeed since V650 is supposed to pro level, right?. Has it worked well with M450? I know DCR has mentioned a couple of times broadcasting power via bluetooth can be an issue.

    • Michael Swann

      The reason would be because the V650 is built on a different software base to the M450. The V650 is based on Android whereas the M450, M400 and V800 are all based on a proprietary code base and changes introduced to one are able to be introduced to the others fairly quickly (at least in Polar speeds) compared to changes for the V650 because of the similarities between them.

      The V650 is a strange beast. Polar tout it as their top of the line cycling computer, but it’s really a standalone product and not something that could be used seriously. There are compatibility issues with various power meters (even though the Bluetooth Smart protocols are supposed to be open).

      I still follow what Polar do and I’m guessing it still can’t do any sort of workouts. Something I think you would want in a top level device. Not that I found the audio volumes to be that loud, so you would probably spend more time looking at the unit than you should to make sure you were in the right zone. By comparison I never had any problems hearing the beeper on the M450.

      I had both for a while. I liked the M450 better from a usability point and because of its smaller size. I sold them both and I like my Garmin Edge 520 a lot more.

    • Davesee

      Thanks Michael Swann!!! That explains so much. Was hoping to get along with V650 for a while but sounds like may have to change computers when I purchase a power meter. When I get closer to purchase I’ll post to M450 and V650 reviews to get a feel how power connected via bluetooth is working or if I’ll need to switch to Garmin or Wahoo (ie something with ANT). Hope you 4iiii arrives soon!

    • Michael Swann

      Thanks. It was relatively quick for my parcel to get from America to Australia (5 days via Dubai!), but another 5 days to get from Melbourne to Adelaide. I got the notification that it’s waiting for me to pick up on my way home tonight. I should get it installed over the weekend.

  57. hong

    The Buy Now: Clever Training link is not working. Goes to link to clevertraining.com which returns 404 Not Found page.

    Thanks for all your fantastic reviews!

  58. SMB

    10% off for DCR readers?

  59. Joanne

    Great review! Noticed these are available for Pre-order on Probikekit, Do you know if they are shippable to US?

  60. Amy

    I recently purchased the 4iiii Precision power meter and felt I’d been consistently having a lower wattage reading than I felt I was putting out. After a few weeks of rides and feeling like my effort was too high for the wattage output I thought it was time to test it. And after testing it against two other power meters (one being a indoor testing facility that I am is sure accurate) my meter reads almost perfectly 15-20 watts too low across the board, low to high effort. And that is killing me in higher efforts. I warm up for a bit and zero calibrate every single ride. So I took note of my calibration numbers and the first number is always over 11,000, around 11,400-11,700 range which appears to be out of normal range. The second number just squeaks in under 21,000, usually 20,700-20,800. My head unit is an Edge 500. I am at a loss, I have emailed the support about 4 days ago. I was hoping someone on here could help me out?? Am I doing something wrong?? Should I try something? I upgraded to the latest firmware thru the app without any issues. Even used the app to make sure wattage reading on my phone was the same as my Garmin.

    • Pearl at 4iiii

      Hello Amy

      The range for the numbers is:
      Number 1: 4000-15000
      Number 2: 15000-25000

      Your numbers are well within those ranges. I am guessing you were looking at an older version of our user guide which had a tighter range.

    • Maarten

      After using the PM without any problems for a little under a year, all of a sudden I’m now experiencing the same problems as Amy. My wattage readings have skyrocketed to numbers in excess of 8000w. When calibrating, the first number no longer reads around 8000 as it used to do, but instead I see numbers in a range of -28000 to 28000. The second number is unchanged around 20740. Have the latest firmware installed, tried factory reset, change battery, etc. Anyone have any other suggestions? Wish I could reinstall the previous firmware, no problems with the unit back then!

    • Maarten – Have you tried reaching out to support?

    • Maarten

      Ray, thanks for the quick response. I have sent 4iiii an email Friday evening UK time. They probably haven’t had a chance to look at my email yet. I was just hoping that someone with similar issues had found a solution. I can’t seem to find a user group or forum anywhere that discusses some of the Precision related issues, aside from this post! I’m sure they’ll contact me in the coming days, I’ve always experienced good customer service from them.

      On a side note, what does slightly worry me is that my cranks (Cannondale SISL2) is no longer listed as a compatible crank.

    • Amy

      A follow up comment about some issues. I used a compu-trainer and Elite stationary trainer to dial in a factor to try and make the meter more accurate. That seemed to work out good, it’s not accurate on the lower end, (up to 60 watts) but once I get into the higher end of things it’s more accurate now. So it’s been great since then. So I did the latest update (1.5.0). I’d been hesitant to install just because things had been working so well, I didn’t want to ginks it. So I did the update and it said to remove the battery after the update. So I did. And then nothing. App wouldn’t connect, Garmin wouldn’t connect, it was like it was dead. Nothing, no bluetooth pairing, in fact, there was nothing to pair to. So after two days of trying like 50+ times, new batteries, I pressed really hard on the cap and then bam, it connected. But when I took my finger off, dead again. So I knew something wasn’t making a connection. So I removed the battery and cleaned the contacts with a q-tip. Nothing. So I removed it again and (I wish I had a pic) on the inside flat face are the larger contacts and they were fine, clean and looked great. But on the inside rim is a smaller, single contact. I think it got/gets pushed in too much and stopped making good contact with the cap/battery. So I used a toothpick to lightly pry it away from the outer rim in hopes of making good contact. And voila, it worked. Paired with phone, app connected and Garmin connected. It calibrated with the Garmin too. I thought I would post here in case someone else has the same problem. Removing the cap/battery could push this tab down too much and cause a loss of connection. If your unit is dead in the water and you recently removed the cap or replaced the battery, just give this a try.

    • Pearl

      Hi Maarten
      a complete response has been emailed to you from support@4iiii.com.

    • Maarten

      Just to follow up on this, 4iiii has taken sublime care of my issue. I’ve sent my PM over from London to Canada on 21 June and today received my crank arm with a new PM installed. Compliments to Pearl and the 4iiii team for dealing with the problem so quickly.

    • Nawar

      Hi when I calibrated my powermeter I get those

      Number 10669 – 20754

      Is there any errors with my powermeter ? Because I think it’s read lower watts than what I proudce

  61. Torsten

    Hi Ray,
    What is your experience with precision 2.0.
    I did my first 3 rides after receiving it 2 weeks ago and was quite disappointed.
    The watt figures even with 10s smoothing applied are jumping around by up to +- 50 Watt every couple seconds without changes in conditions or intentional changes in applied power. And it is not correlating with the push/pull cycle.
    4iiii informed me that I am one of the first customers who receives the new version. My assumption is that this upgrade is not really ready for production yet and I may have been selected as an alpha or beta tester. At least support from 4iiii so far was great an I will probably receive a feed back soon after I have supplied my .fit file.

    • I’d work with 4iiii support, as something definitely sounds amiss, so getting them the .FIT file will help them troubleshoot and see if it’s somehow just a bad unit, or something got damaged/etc…

    • Torsten

      Thanks,
      yes of course 4iiii has the .fit file and they are working on it for some days now. I was just curious if there is anybody out there who has a functioning version 2.0 already.

    • Frank

      Same issue here, I got my version 2 this week (On a Dura-Ace 9000) crank and the battery cap was broken… To their credit, I emailed them within a hour of getting it and they Fedex me a replacement cap. Now the real problem. I have been riding with it on a Tacx Vortex trainer for a couple days now and it is a complete mess. Though the trainer says 150-200 watts in general, Apparently I am pushing 375-550 watts with the 4iiii, going between 18-20mph, no resistance (As reported by their iPhone app and my Garmin 520). And the readings jump around second to second as if I was riding on cobble stones or something. I have tried for a couple days to contact customer support, since the cap issue, but they will not respond to my emails. Took the money and ran…..Horrible….

      I will let you know if I ever hear back, but for now looks like I have an expensive paperweight on my hands. I even wrote to the sales unit, but they would not respond either. DC really needs to consider taking them off his list until their Customer Support is more reliable, especially if their PowerMeters don’t work consistently.

    • Hmm, it’s not normal for them to not respond (usually they respond quite quickly, as other folks have noted here). Any chance their responses are going into your Junk/Clutter/Spam folders somehow?

      (Also note that just below your post they are replying here to folks as well)

    • Pearl @ 4iiii

      Hi Frank

      Pearl from 4iiii here.

      I am surprised that you haven’t been able to connect with us since we have you as an authorized email in our help desk. I searched our help desk and other than you order emails and battery cap issues we truly haven’t received anything from you. Please try contacting us again at either support@4iiii.com; cranks@4iiii.com or give us a call at 1.800.218.3095. and we’ll get your unit fixed.

    • Torte

      I love your short and in depth reviews. It is so helpful to get an objective overview and insights about, what is on the market.
      The same was true for the precision 1.x review. However, after 4iiii moved to version 2.0 I think the review could be misleading because the reviewed product is not what you get when you order. And looking into the feed back here concerning v.2.0 it is overwhelmingly poor. There is no indication that 4iiii has the mentioned issues solved what renders at least a significant amount of those products useless. It would be helpful for readers may be to mention at the begin of the review that the reviewed product is not anymore available (may be on special request only) and that the current product has not been reviewed yet or people should follow the comment at the end to find out more about current complaints.
      I sent my fit file to 4iiii May 4th with quick response from support what was great. However, until today it does not seem that there is a solution.

    • Frank

      As a follow up, Yesterday I did receive a follow up from both Pearl and another customer service rep from 4iiii. Looks like they were having some technical issues which prevented them from receiving my emails for a couple days. (They do need to look at contingency or COB plans in the event email is not working again especially since this is the only support lifeline provided to consumers (RE: No general Chat or Phone communication).

      Looks like they are going to release new Firmware next week 5/23-27. Once installed I will post the results. They also asked for me to wait till the firmware was released and to contact them and they would help me immedattiatley if it did not help resolve me issue (Nice touch!!) If all goes well, I will be requesting an upgrade to the right side as I have had previous success in writing to 4iiii for feedback, their shipping agreement and timeline was spot on, and their initial warranty follow up was over the top fantastic. Figures crossed that all works out.

    • Aaron

      Thanks for the update, Frank!

      I had un-paired the Precision because the power data was so inaccurate and unreliable, so I’m super-excited to hear about the firmware release next week. Fingers crossed this solves the problem.

    • Frank

      As a follow up. Looks like the firmware is a little delayed, however, in the meantime, I did some more reading of the boards, and some feedback from 4iiii, I was able to correct my issues and ride very well.
      1) I reset the factory settings
      2) I recalibrated with no motion, no clip in, the crank facing straight down

      With this and the use of the averaging reading I was able to closely sync with my Tacx Vortex Trainer and also get a great ride in with reliable readings. Looking forward to some great rides going forward and also the right sided power meter install.

      Frank

    • Aaron

      I tried this on my Precision v2 and it seemed to work… Until the water stop about 25% into the ride, when presumably the PM went to sleep due to inactivity. When I started back up again, the erratic readings were back… Eventually the Precision gave up completely and just returned 0W even though I was pedaling (cadence readings seemed spot on). I tried steps 1 and 2 again, but it didn’t work this time (did I mention that it was raining on me while I was sitting there fumbling with my phone to do factory reset?). Ultimately, I unpaired the Precision PM and went on with the ride without power readings.

      Using a Garmin Edge 520, so paired ANT+.

      Pretty disappointed with the PM. Debating a return…

    • Pearl

      Hi Aaron
      Have you contacted 4iiii customer support with any of your issues? We would be happy to help. support@4iiii.com. Just looking at your history here, I would say that the new firmware will address your problems. Release date is June 7.

    • Aaron

      Hi Pearl,
      Yes, I sent a note to 4iiii support late last week and got a response this morning from Lee. He’s looking into it. This was before I knew that the sleep/wake cycle mid-ride may confuse/break my Precision PM. Is this a known problem?

      I have my fingers crossed that the firmware update will address the issues I’ve seen, so I’ll see what I get after 6/7.

      Thanks for the response!

  62. Bici

    Hi Ray,

    a friend of mine will get one of these in a couple of days and I have to figure out a software-workflow him. I want to try out goldencheetah 3.1 and 3.3 and need a .fit sample file to test.
    It would be really great if someone can provide a sample .fit file to test or give a link to file.

    Thank you for your “massive” tests.

  63. Michael

    Was anyone successful in zeroing the PRECISION with the 4iiii Android app?

    Despite Pearls instant support I’m not able to zero it with my smart phone. PRECISION firmware is 0.4.0, SW version of the app is 1.5.0. Both are as far as I know the latest ones.

    Maybe there’s an incompatibility between my smart phone or the Android version and the app…

    • Pearl @ 4iiii

      Hi Michael

      I referenced your PRECISION serial number and it looks like we also had some more issues with your unit. Pop me another email to support@4iiii.com so we can start the RMA process.

    • Rob

      So does anyone have a properly working V2 4iiii here?
      I’d love to buy one, but fearful having read the comments.

    • Rob

      Also I notice firmware is at 0.4.1, this being the case is the product still in beta, as I have always thought a designation of 1.x.x would be a full production firmware?

    • Sometimes, but not always.

    • Pearl at 4iiii

      Hi Rob
      The PRECISION v 2 (as well as Gen 1) both are functioning. The problem that you reference was simply an allocation of the unit serial number to the database grouping for the version released. This has now been corrected.

    • Pearl at 4iiii

      Rob – our nomenclature may differ from yours. Our Beta firmware versions are fully tested before public release. As a head’s up, new firmware version 1.x.x will be released shortly.

    • Michael

      This is getting more and more anoying.

      I received my unit end of April and I never get it running. It’s impossible to zero it by the 4iiii Android app. Firmware of my unit is 0.4.0 and Pearl adviced me to update it to 0.4.1. Trying the update I always get the message that it is up to date. Later Pearl confirmed that 0.4.0 is the latest. Here I can read that there is a FW 0.4.1 available.

      Now I’m asked to return it to 4iiii. I mailed Pearl twice how to proceed and didn’t get an answer. Wasn’t the unit properly checked before it left 4iiii. I’m located in Germany and shipping it back and forth is always an effort and takes time. Meanwhile I can’t ride the bike.

      I’m completely disappointed about the PRECISION. For now it’s just a piece of useless crap to me.

    • Pearl

      Micahel
      You were asked to return your crank for repair as your unit could not be fixed remotely.
      Version 0.4.0 is the firmware for Gen 1 PRECISION units.
      Verision 0.4.1 is the firmware for Gen 2 units. We require different versions as Gen 2 has an additional strain gauge.

      Presumably repair of your unit will convert it from “a piece of useless c****” to a tool you can use for your training. Repair units are always priority in our queue so turn around is very quick. We do try to accommodate customers with racing schedules and have a loaner crank program.

      We are trying to catch up to tickets that were misdirected over the past two weeks. I see your ticket arrived on Monday (a holiday here in Canada).

  64. MARK HILL

    Hi, considering buying the new G2 4iii power meter here in the UK. Have all the issues mention above now been solved? Also, is it possible to zero (calibrate) the power meter while riding? I say this, as I often ride early in the morning when the temp is very low, but finish the ride when temps are very high. Without active temp compensation I fear the power numbers will not be accurate. Thanks

    • Torsten

      Hi Mark,

      My iussues are not solved and you should not rely an DCS review when it comes to accuracy if the product.
      1) Issue with DCR’s product sourcing
      As DCR explained the review is not based on a random shippment. This is fine if the producer has production process under control and you can trust that the product you receive is comparable with the product hand selected and may be massaged for DCR.
      2) No effectiv pre shippment product quality control
      With what I am reading and what I have experienced there is no in production quality control. The product quality control is left to the customer unless you are DCR. And this is especially bad if it is how it seems that 4iiii has production issues.
      3) Cost of importing to Europe
      Since you are from the UK you have to consider that it is more troublesome to send the unit back one ore more times. I imported the device to Germany and paid overall for VAD, Custom and fedex handling 98,- EUR. A small part of it is VAD and Custom for my own used crank arm due to wrong shipment declaration by 4iiii. So, I would be positively surprised if there is no new fee I need to pay to fedex for the product return.
      4) Issue still not solved
      The latest is that I have been advice to wait for the new firmware after 4.01. I tried to upload it today but in contrast to what has been promised there was no update available.
      An the remedy from Frank is not working for me. I have done all this things from the begin.
      5) Can you Zero between rides?
      Don’t know what the impact to seamless recording is. I did not try it because anyway readings are not accurate in my case.

    • MARK HILL

      Thanks for your reply Torsten. In the UK you can now buy the crank with the power meter already installed, so no need to send off your crank to 4iii in Canada. It cost a little bit more, but it means no hassle with shipping your own crank. Hopefully these pre installed power meters have been checked and passed some sort of quality control.

      I really hope you get your 4iii power meter problems sorted out. I think i’ll wait until people start saying the 4iiii G2 is working before I purchase one.

    • Michael

      I agree to Torsten. In particular concerning point 2).

      I received my unit end of March and since then I’m struggeling to get in running. It’s impossible to zero it via BTE. Can’t say about ANT+ because of no available ANT+ device.

      So theres definitly no proper quality control in place. Paired with an unstable manufactuirng process oversea shipments become jeopardizing.

      No I’m in the process of returning it to 4iiii. Located in Germany this is no fun at all. It’s very excitng to see if I’ve to pay customs and VAT again receiving the unit back from service.

      So I recommend everyone not located in Canada or North America to wait until all issues are fixed, manufacturing process is stable and quality controll took place.

    • Hmm, I think there’s some confusion.

      1) Product Sourcing: I actually often source products from random retailers. In fact, eventually all products I use are just from retail. It appears you even missed the very first section (3rd paragraph) where I talk about how many attempts it took initially to get a good unit. And that process. A process which seems addressed based on lack of complaints from others since then.

      2) Quality Control: If I understand things correctly, there is now a total of 2, perhaps 3 people who had issues with a Gen 2 unit (including you). The other person, Frank (above) it sounds like 4iiii is working with him to sort out his issue. Given 4iiii is shipping boatloads of these per day, it stands to reason that this is simply a case of a lemon along the way for some reason. It happens to all companies, big and small. And, as is usually the case, people find the first thing that Google returns for a given product (here usually) and write about it. Happy people don’t tend to post.

      3) Cost of importing to Europe: Actually, you’d only pay customs on the first one, as you bought a product out of the country. But then again, you paid less than a power meter would cost in Europe (which you know). Folks haven’t said there’s been any issues with repairs costing anything from a VAT standpoint.

      4) Have you talked with 4iiii since trying and it not working?

    • Michael-

      You don’t have a Gen2 unit, since if you received in March, that was before they announced the units in mid-April.

      Cheers.

    • Pearl

      Hi Michael
      We appreciate your sharing your experience.
      To clarify, the duty and taxes for RMA repaired units are covered by 4iiii Innovations. In the event that you are billed in error, notify us and we will have the charges reversed.

    • Pearl

      Hello Torsten
      We’re sorry that the delivery date for the new firmware was not met. The development team decided that we would release the new app first and then the firmware. You can expect the new app in the store on Wednesday June 1.
      To clarify – the version last released for Gen 2 models was 0.4.1; for Gen 1 models was 0.4.0.

      The new firmware will be 1.0.0.

    • Michael

      Hi Ray,

      of course I know that my unit is Gen1. But nevertheless it’s hard to understand how a device that can’t be zeroed left the plant. I would expect a 100% EOL covering every function. If this is in place no faulty device is going out.

    • Torsten

      Ray, I think we should allow for critical replies to specific questions even when the experience is a little less satisfying then your review may suggest.
      1.
      From what you wrote at the top of your review it is very hard to recognize what you claim now that all testing has been done on an anonymously purchased product. Didn’t you write that the product needed to be sent back twice to you and you had some conversation concerning your right/left leg anomaly? Your great accuracy results have then been done with a 2 times fixed unit (Gen 1 by the way) which has been shipped to you. Why do you think that 4i did not know that the fixed unit was for your?
      2.
      And please help me. What makes you so confident that there is no issue with getting consistent quality from Gen2 manufacturing? 2 people confirmed that they have a bad product and nobody so far replied to my question if anybody has gotten a functioning Gen2 version which matches your great test results. In addition I am talking about Gen2. And as you know, your accuracy testing documented Dec-2015 has been done with Gen1 way bevor Gen2 has been released in Apr-2016. In the middle of the review you now mention that you are on Gen2 without telling if any of the graphs have been updated. May be you could clarify that a bit.
      And what further makes be suspicious about a general quality issue is the fact that 4iiii says that they moved to Gen2 what “moves traditional power monitoring a quantum step ahead to improve accuracy and …”. But why does anybody need improved accuracy if it is as brilliant as your charts are showing (< 1% deviation from competitors power meter).

      To say it again, I love your reviews. And I can not imagine how it could be any better. It just strikes me why you are so much insisting that everything is perfect with Gen1 and Gen2 without providing any reasonable argument. What keeps me somehow relaxed is that I can rely on an exceptional support from 4iiii, but still would now be a little patient to order from Europe until there is some evidence that most Gen2 are working accurate.

    • RE: 1 – Sending back product: It had nothing to do with quality control. It took 6 months of them realizing/fixing their algorithms/design had a flaw in it, that didn’t account for specific pedaling styles (apparently mine). It wasn’t a fixed unit, it was brand new (in many ways) with new algorithms. You’ll remember during that time I placed banners/warnings at the top of all my pages basically saying it wasn’t working for me, but was working for others.

      RE: Gen2 units: I’m not saying you aren’t having a problem, but rather I’m responding to someone above saying that all Gen2 units are somehow broken. Or, to the fact that some people are trying mix in a random Gen1 unit in implying it’s Gen2. That’s all. I’m simply pointing out that when anyone says that, it’s usually BS. If every unit that was leaving 4iiii was broken, then this post would have been immediately swamped with comments of people having issues. It’s not.

      The problem here is that 4iiii and folks here are calling these units ‘Gen2’, when in reality, they also called the ones back in October Gen2. Thus, confusing the crap out of things. These probably should have been called Gen3, which would have fit in nicely with the ‘3D’ marketing stuff they’re doing.

    • Karl

      Servus Michael,

      had the same issue with my gen1 PM – Problem was I had removed the Batterie and inserted the same used one again, which leads to the issue not beeing able to Zero anymore.

      Pearl’s answer solved it for me:
      This appears to be caused by a low voltage battery problem.

      Follow these instructions to perform a clean and perfect zero offset using 4iiii app:
      1 – Exit 4iiii application and kill the app
      2 – Restart Bluetooth by turning off and on Bluetooth radio
      3 – Put a fresh battery on the power meter
      4 – Run 4iiii application and after connecting to the power meter, go to “PRECISION configuration” menu
      5 – Click on “PRECISION Info” button
      6 – Make sure the Battery Level is 100% and then click on “Advanced Config” (iOS) or choose “Enabled Advanced” from the app menu (top right of screen)
      7 – Click on “Zero” button and wait for the response. Don’t forget to put the crank in vertical orientation ;)

      You can perform Zero any time between 100% and 15%.
      The problem is:
      If you put a new battery, it shows 100% and counts down the percentage but if you put used or old one, since the pod doesn’t have any history of that battery, it shows 50% by default (and counts down).
      It means, you can trust battery percentage only when you put a new battery and you never remove it until getting low battery message. The battery usage tracking system works only on new batteries.
      Regards,
      Pearl

    • Michael

      Hello Karl,

      as I received my PRECISION I set it in operation with one of the batteries provided by 4iiii. And from the start with the new battery in place (charge shown was 100%) it refused being zeroed.
      So I replaced it by the 2nd battery provided by 4iiii. same result.

      But one other point: If zeroing is possible between 100% and 15% battery charge only what does this mean if it is neccessary to zero prior every ride? Simply that you have to live with less accuracy for the remaing 15% battery charge or to replace it as it gets below 15%.

    • Eric

      I am very happy with my new Precision V2 and with the coustomer support.

      2) My Precision V2 works fine – even during rain
      3) Cost of importing to Switzerland: 45€/48CHF
      4) pairing with my Android phone (Motorla Moto G2) is difficult. It works better with my Ipad3. I have the same bluetooth difficulties with other Bluetooth gadget f.e. Wahoo TICKR X
      5) Yes I can by Garmin or by the app.

    • Richard R

      Hi Torsten, I had to send back my 1st Gen power meter as it wouldn’t connect anymore, they sent me a 2nd Gen power meter as a replacement and since then I haven’t had a single problem with it.

      I am obviously just 1 person, but for me it seems all good at the moment

    • Javier

      Only 45€? I’m considering to buy it, but usually in Spain, we have to pay 21% as VAT (including shipping costs…) plus mail “handling” (about 20-30€ more). I’m guessing it would cost me about 100€ or more. I don’t know how it works in Switzerland… but one guy from Austria (Karl I think) stated above more or less the same taxes I have told you… I really wish to have your luck in this case.

    • Eric

      The same in Switzerland, but the VAT in Switzerland is about 8%. :-))

  65. TMR1980

    Hi. Noticed the stages PM only needs to be zero offset every week but the 4iiii Precision needs to be zero offset every ride. Ideally don’t want to have to do this every ride. what is the reason for the difference, is it just down to manufacturer opnion / advice or is stages more capable of not being offset as frequently?

    • Actually, Stages wording it kinda funny. Basically it’s marketing spin. As they admit in their own support article that if you care about your data being accurate/trustable (such as for a race or fitness test), you could zero offset: link to support.stagescycling.com

    • Torsten

      Thanks Ray,
      I am curious how the charts would look like in more detail if the unit works as it should..
      Would you mind to make one of the .fit files available you used as source for your review? I am aware that the tested version is different from mine.

    • TMR1980

      So I get that best practice is to zero reset a PM every ride….if I didn’t zero reset the 4iii every ride e.g. once per week are the results still likely to be relatively accurate? Or do you think the Stages would be more accurate due to the automatic temperature compensation?

    • Hi Torsten-

      All of my original data from the review is within the zip file at the end of the ‘Power Meter Accuracy Results’ section. It’s the last line: link to dcrainmaker.com

      While in newer reviews (like, last week new), I also link to the individual charts in my analysis tool – I didn’t have that option last fall. But, I just went and picked one of the charts from above (the Nov 8th one), and set it as public. So it’ll save you time from having to find a way to compare the original files in another tool. Here’s a link to that for that plot: link to analyze.dcrainmaker.com

      TMR1980-

      I would suspect so, but I didn’t test for that. I typically zero all power meters at the beginning of all rides, and then often about 10-20mins into a ride since most temp compensation systems take about that long to take effect when going from indoors to outdoors.

      Cheers.

  66. MARK HILL

    So does 4iiii have active temp compensation or during a long La Marmotte type event, were temperature can vary from one extreme to another, would have to zero the offset throughout the ride? This is important as I really just want to zero the 4iiii at the beginning of the ride and leave it.

    • Hello Mark,

      PRECISION was designed to maintain a high level of accuracy across a range of temperatures. Should we find that additional compensation mechanisms are necessary, we will address that need through a future firmware revision. We continue to recommend that riders re-zero PRECISION before every ride.

  67. Brantel

    Any options for us out here with the RS500 compact crank to use one of these by swapping out the left crank arm with a model that is flat on the inside? If so, which one will fit the RS500 crank and be close to the same weight?

    • Pearl

      All of the Shimano crank arms that are compatible with PRECISION (105, Ultegra and Dura-Ace) will be compatible with your crankset, since they all use the same Hollowtech II interface between the left and right sides. There will be no inaccuracy induced by running such a combination. The only thing to be careful of, is to make sure that the new crank arm is the same length as that on your right side.

      In a 172.5 length the left crank arm models weigh (in grams) as follows:

      105-5800: 198
      Ultegra 6800: 202
      Dura-Ace 9000: 176

      I don’t have the weight of the RS500 left crank arm but due to its construction it will be heavier than any of these 3 models. However you should not experience any significant imbalance if you were to use one of these with the 9gm PRECISION installed.

    • Stephen

      Pearl said: <<I don’t have the weight of the RS500 left crank arm but due to its construction it will be heavier than any of these 3 models. However you should not experience any significant imbalance if you were to use one of these with the 9gm PRECISION installed.<<

      I had an RS500 crank on my bike. Found a lightly-used Ultegra 6800 crankset with the intention of sending the left arm to 4iiii for installation, so I put the RS500 left crank arm on the Ultegra–which is the opposite "switch". It works fine and I'm not sensitive enough to notice any difference whatsoever. The Ultegra crank arm will go back on the bike as soon as I'm recovered from a broken arm. Unfortunately with no 4iiii power meter–I gave up after being promised someone from 4iiii would contact me to discuss my issues with the "upgrade" policy for purchasers of single-sided units. All that seems to have been resolved, but too late for me. Overall, I think Pearl has performed very well and has been as helpful as she could have been. Not her fault whoever was supposed to get in touch with me didn't.

      Bottom line: I'm really tired of the starts and stops, promises, changed promises, failures, upgrades, improvements and these are not just related to 4iiii, but the industry in general. It's just flaky beyond belief taken as a whole. I'm thinking of just getting started with a Powerpod as a "good enough" device and wait for the day, which I'm certain is not far off, when power meters cost <$100.00, come standard on premium bikes and "just work."

      STP

    • John

      What makes you think the Powerpod is without problems?

    • TMR1980

      I had same dilemma and bought 4iiii largely because of lower price. It seems v consistent and as I’m new to power cant comment on accuracy. Its worked exactly as it should do 2 days in. 4iii is cheaper, maybe not been on market as long as Stages and gives you ability to upgrade to double sided. I know from experience that the 4iiii customer service is top notch. All that said Stages get good reviews and are a proven product.

  68. Torsten

    Hurray, yesterday I had another check to see if the promised new firmware for the Precisioin Gen2 is available, which may solve my issues. And yes, there was a new version 1.50 available. So I updated and did a short test run. And yes, much to my joy, the precision was working as expected more or less. The up and down power spikes disappeared and just of a sudden the 9g useless piece of plastic got a purpose.
    I am happy that I was waiting for the 4iiii guys to come up with a release that finally turns the Precision Gen2 into a power meter.

  69. Jacky Wong

    I just ordered the ride ready one and expected to receive it on July from CT. Hope there is no delay.

  70. Chris Wiswell

    Hey does anybody know if this has the same issues as Stages with it dropping out on GPS Watches?

  71. Brian Mosley

    As a father of 3, I have limited buying power, your reviews have helped me tremendously!! Thanks for the awesome 4iiii review and other reviews as well. Saving up for one now. Love your site!

  72. Andrew

    I recently received a Precision and have a query for Ray, Pearl and/or other 4iiii staff please?

    Do I understand correctly that the precision does not have an auto-zero type of function – eg similar to pedaling backwards on some other power meters? This was kind of asked above but not answered?

    Also, I have a Quarq pm (Red 22 model), and when paired to a Garmin 520, upon waking up the quarq the 520 detects it and the ‘calibration’ message pops up right away to allow for auto-zeroing. This, however, doesn’t happen with the Precision upon wake up, so you have to flick through the menus to get to the cal/zero page. Does anyone know why this feature of the 520 doesn’t work with the Precision? Am I doing something wrong? Is this linked to the (assumed?) lack of an auto-zero feature – eg do 4iiii insist on riding for several minutes before zeroing?

    Final note, the Precision has worked flawlessly within the bounds which I have used it. Pairing and zeroing on the 520 worked right away, firmware upgrade has been fine and no dropouts at all. Haven’t bothered connecting to ride or zero vie Bluetooth so can’t comment on that. Also can’t compare numbers to the quarq but have no good reason to believe the number aren’t tight.

    Thanks in advance!

  73. Jacky Wong

    The official announcement said the ride-ready PM will be deliver on early July. Did anyone received it?

  74. Kerem

    I placed my order ( ride ready )6 days ago and now its on the way by fedex

  75. Jacky Wong

    I bought it through CT, hope it won’t take too long.

    • Pearl

      Ride Ready orders placed directly with 4iiii Innovations began shipping June 30. Please contact your dealer for a delivery date for your order.

    • Jacky Wong

      Thanks, Pearl. I checked my online record in CT website. No luck at this moment. Will e-mail them today.

    • Jacky Wong

      checked with CleverTraining, the ride-ready PM is not arrived yet and they don’t have any shipping schedule from 4iiii. It is 12th Jul now, I am worry that I won’t able to receive it within July 2016.

    • Chris

      I have a Gen 1 precision. The other day mid ride I lost power but still had cadence. Changed battery, restored factory calibration, zero calibration. Nothing has seemed to work. Anyone else have this problem?

    • Dr_LHA

      So what’s going on with the Clever Training orders? I emailed them today and they told me no news yet on a ship date. Given that they already charged my credit card for this thing 2 months ago (which I have to admit I was pretty peeved at, most companies won’t charge until an item ships), it’d be nice to know a real shipping date.

    • Jacky

      I also want to know, it is the first time that I buy from clevertraining. Up to now, I don’t know when it will be delivered to me and there is no update from CT.

    • I reached out to CT, who has been trying to get information from 4iiii. It sounds like there was some substantial turnover at 4iiii’s in the order processing department.

      Either way, they’re escalating and hope to have an answer shortly.

    • Jacky Wong

      Highly appreciate your help. Usually it shouldn’t be problem from CT side. I was wondering 4iiii fulfill all direct order before deliver to CT. Now the root cause is found because of your help. Thanks again. :)

    • Dr_LHA

      Thanks Ray.

      BTW Jacky, I assume that the “substantial turnover” being referred to here is staff turnover at 4iiii.

    • Yes, correct, at 4iiii’s in the position that liasoned with retailers.

    • Dr_LHA

      Thanks I presume to Ray’s intervention, I got my answer. Delivery expected late August. *Sigh*.

    • lkr

      Contact 4iiii [info@4iiii.com]. I’ve found them very responsive in walking through the problem.

  76. John

    I have a Ride Ready Ultegra on order from CT with the same “mid-July” ship date as everyone else, but the 820 I preordered on Wednesday shipped this afternoon, so they are obviously shipping what they have in stock. Maybe someone from 4iiii can chime in on availability?

    • Pearl

      The world-wide adoption of PRECISION is strong and we are working hard and fast to get PRECISION on your ride.

      1. Clever Training has received Ride Ready inventory and more is being shipped this week

      2. Some models can be more quickly filled via our Factory Install Program.

      3. Yes, we are growing fast and looking for talent. Looking forward to hearing from passionate riders.

    • Jacky Wong

      Thanks, Pearl.
      Hope I can receive my PM soon.

  77. Jacky Wong

    I would like to share a good news, my 4iiii ride ready PM is on the way to my home. Expected to receive it on Monday evening.

    • Deji Odetoyinbo

      Jacky Wong, did you receive yours? How has it been? I’m about to place my order for a Precision Pro. Trying to get a sense of whether the production / delivery difficulties have been sorted out.

    • Jacky Wong

      Yes, I received it on 25 Jul from CleverTraining. It works and I am sure you will love it too.
      But don’t forget to install it with required torque. Otherwise, the measurement maybe wrong.

    • Dr_LHA

      Still waiting for mine, ordered back in May.

      So no, the production / delivery difficulties haven’t been “sorted out” IMHO.

    • Dr_LHA

      In case anyone cares, I finally got my 4iiii PM in the mail yesterday.

  78. Jacky Wong

    Need help from other owner of 4iiii PM.
    I found that I got 3-4 difference reading within 1-2 seconds.
    From less than 100w to 180w.
    Is it normal? Please share your valuable comment with me.

    • That’s normal for a power meter. It may go (at 1s intervals): 204w,228w,192w,168w,186w,192w, etc…

      It’s why most people tend to use various power smoothing options – like 3s, 10s, or 30s smoothing.

    • Jacky Wong

      Highly appreciate your quick reply. Fully understand now, thanks Ray and Nawar.

  79. Nawar

    Jacky I think it’s ok it happens to me but you should choose avg power for 3 or 10 sec from your garmin better than current power .
    I hope my reply is clear my English not that good

  80. David Zak

    Hi Jacky, I’m interesting if the 105 left crank will work with Sora chainrings, can change only cranks on my Sora? Is it possible, anyone tried this?

    • Jacky Wong

      Don’t quote my word but I think it should works.
      However, it won’t work if you plan to upgrade the chainrings (right hand side) because Sora is 9 speeds.

    • David Zak

      Thanks, for quick response!
      Ok I will try this anyway, if it won’t work this will be a good reason to upgrade my groupset!

  81. Marklemcd

    I bought the precision with the factory install option today (8/26), I wonder how long the total turnaround will be? Will there be a long lag before I get my shipping package?

    • Pearl

      Hi Mark
      We are ready to receive you crank arm for installation. Your shipping logistics have been sent to you from 4iiii.com.

  82. Adrian Cartlidge

    Warning – if you are from the UK do not buy this product direct from 4iii in Canada or USA. Although its tons cheaper to send off your own crank arm and have them fit it you will get stung with a huge duty and tax import charge like i did. I payed £340 for the crank arm installation onto my ultegra left crank arm and then had to pay £74 duty and tax for the import (which i had to pay after i had received the crank back). Totalling the cost at £414. You can buy other power meters for a lot cheaper from UK companies.

    • Sam

      Hi Adrian, curious to read of your experience as was looking into this as based in the UK too. What other power meter is cheaper than the total cost of £414 you paid? That aside, can you please post your experience of the power meter when you’ve tested it and which ANT+ head unit you are pairing it with?

    • Adrian Cartlidge

      You can get the Zwatt power meter for left arm crank for just £143. I would go with that and wish i had. But failing that pay the extra cash and get a new left crank arm with power meter already fitted. Not worth messing around sending your crank arm off because the money saved is negligible once you add the tax and duty. Plus if it fails you have to return it and will have no crank arm until its returned.

    • Adrian Cartlidge

      I forgot to mention – the power meter itself is ok. I had some issues with battery contact meaning that it didn’t actually work when i received it. Had to bend some battery connectors a bit but worked after that. Theres a 4iii app for android and iPhone which is pretty useless as works well with the power meter but has limited compatibility with heart rate monitors – i can’t get my polar HR to connect via BT so use strava. The data seems accurate but then most modern crank arm power meters are. I haven’t used ANT just BT.

    • Sam

      Thanks for the reply. Agree that buying the single crank from a UK dealer isn’t that much different in price especially with the weak £. And you get the support locally too.

      Back to the drawing board I suppose. I am keen on the dual sided power meter though and might wait for the release of the Dura Ace 9100 crank set with integrated PM.

    • Michael

      Adrian, are you able to zero your PRECISION via BT with the 4iiii App for Android?

    • Adrian Cartlidge

      Yes. Works better I’ve found if you hold the phone right next to the meter. Sometimes fails if it’s on the handlebars or at hip height. To be honest I don’t zero mine very often because the readings are no different when I do.

    • Michael

      Very interesting! Zeroing always fails with my Huawai and the 4iiii app! No matter how close I get to the pod. On the other zeroing works with my Polar M450 which is intalled on the stem.

    • Will

      Hi Adrian

      thanks for the info. I bought mine from Hargroves for £324, a lot cheaper. On the face of it sending off your crank arm seems cheap but the shipping on the 4iiii site seemed an awful lot and like you say, the support is in the UK this way too.

  83. Javier

    It seems this device measure cadence, but speed too? or I still would need speed sensor?

  84. Dennis

    Hello
    I cannot seem to upgrade the firmware of my precision to the current one.
    I have the 0.3.0 but would want to upgrade to the 1.5.0. The app is the latest version

    • Dennis

      Solved my own issue – used our son`s phone – looks like after upgrading to the latest ios firmware, ios10 the other day, it created issues with me trying to upgrade the pod`s software, i downloaded the app on his ip5 which was still not upgraded – took less than a minute to upgrade itself.

  85. Richard S

    The link to “4iiii Precision Power Meter” on Clever Training at the end of the post is 404. Perhaps replace with link to clevertraining.com ?

  86. J

    Considering a left side version of this for my winter / cross bike.

    Couple of questions;

    re:auto zero every ride, i dont have any issue with this – but during winter when the bike is kept partially inside (porch) would it be a better idea to zero 5 minutes into ride (rather than wait outside in the cold), or would this make no difference – is the temperature at which you auto-zero important? (i have previusly read re:stages to “leave bike outside for 10 minutes before you calibrate”)

    reading through the comments i can’t seem to find anyone that has water ingress issues, is this the case? A winter through northern Europe would certainly be a good test.

    • tmr1980

      Hi – think that 4iiii recommend that the PM is calibrated 5 mins into ride so that the PM has had chance to adapt to the actual temperature.

  87. Michael Swann

    I ordered a pre-installed 105 left crank arm through Clever Training using Ray’s discount code. I have RS500 cranks on my Giant Defy 1 Disc. Hopefully the weight imbalance won’t be too bad otherwise I’ll have to buy 105 cranks as well. I found one instance where this combination worked well, so I think I’ll be okay.

    Has anyone else done the same? Has it been a problem?

    • Davesee

      Hi Michael! Have you received it yet and got it working? Seems like you’re always a step ahead of me so interested to hear how your power experience goes.

    • Michael Swann

      Not yet, it’s on a plane from Florida. I managed to beat Matthew.

    • Michael Swann

      New 4iiii received and installed. Took all of 15 to 20 minutes. For anyone interested, the weight difference is about 50 grams. Doesn’t seem to cause any static balance issues.

      My Wahoo Blue SC V2 transmits speed info by itself just fine (no cadence magnet installed on the new crank) and the 520 picks up cadence from the 4iiii. Seems I didn’t need to buy the extra speed sensor after all.

  88. Roger

    I’ve had my 4iiii for a couple of months now, it seems very reliable and I’m very happy with it.

    I did a test with a friend’s Vector 2s attached to the same crank yesterday, a 20 min ride with a few efforts showed the 4iiii reading around 9% higher AP and NP. 30s smoothed image attached, 4iiii in pink. It’s the first same-bike comparison I’ve done, could anyone explain the discrepancy? If anything I would have expected the Vectors to read slightly higher, not the other way around. Did I need to do a longer test? Is it possible that 4iiii reads 10% high, or the Vectors 10% low in certain conditions?

    I also did a 4iiii vs Limits comparison but will save that for a separate discussion.

    • That’s not too bad for a first ride, at least they’re consistent. Which makes me point more towards slight calibration things/settling. What did you do from a calibration test standpoint?

      And if this was the first Vector ride, I’d definitely give it another ride (consider this one a settling test, which is 100% normal).

    • Hi Roger,

      This is Billy here, product development leader at 4iiii. Thanks for posting your findings.

      To explain what you’re seeing between PRECISION and Vector2S requires a bit of background information. Please contact us at support@4iiii.com and I’ll be happy to discuss more.

      Cheers,
      Billy

    • Roger

      Both PMs were calibrated at the same time, right after Vector 2s had been put on. 4iiii had been on for a few hundred km, Vectors were fresh on the bike but had been used for 50ish km that morning on a different bike and have been well used.

      I’ve just seen your review of the original Vector where you suggest doing a few hard efforts and popping the battery cap before calibration – both things I did not do. I only pedalled softly to get up to required cadence and then calibrated. Could this explain the Vector reading a little low?

    • The hard efforts basically settle Vector, it’s definitely something you want to do. I’ve never seen an accurate Vector install without doing so.

    • Jacky Wong

      I am not an expert on this but I believe it is good because the reading from both PM are consistent. By the way, did you install the Vector with the required torque level?

    • Roger

      Thanks Ray, will try again at some stage.

  89. JAVI

    Which is the PIN number of the app to pair the app with the power meter? I have tried 1111, 0000, 1234… and they don’t work.

    • JAVI

      I anser my own question. When opening the app, there is no need for any PIN. It ask me for a PIN number, as I tried to pair my mobile via bluetooth in the normal way.

  90. Nathan Budd

    I was just about to take the plunge on the 4iiii 6800 power meter, and had been given vouchers for Evans Cycles in the UK so that I could buy it.

    I’ve gone to the site, and for the 6800 the 172.5mm version is missing (they only have 170mm & 175mm) and the reply from Evans is “Unfortunately, our stock system indicates that this size is discontinued by the suppliers.”. Any news on this? As ProBikeKit in the UK only has the 165mm and 172.5mm.

    Has anyone heard of the Precision being discontinued? I don’t want to buy a legacy power meter. If needs be, I’ll spend the extra and pick up the Pioneer single side.

    • Chris

      4iiii’s website still shows them available but Clever Training website says they are not. You could send 4iiii an email and they may let you know what is going on.

    • Pearl

      Production of PRECISION is going full tilt as are our orders. We have just shipped a large quantity of the Ultegra FC-6800 172.5 to our UK distributor and they should be with Evans Cycles shortly. We’ll ask them to modify their out of stock message; thanks for bringing it to our attention.

    • Vitaliy

      Pearl, from what I understand dual side power meter is not available for Cannondale SI cranks. Any plans to add dual side option for Cannondale folks?

  91. Peter

    I’m in the market for a new power meter and am considering the 4iiii dual sided. Any idea when you will have the in depth review posted on this? Apologies if you have already mentioned this and I’ve missed it.

  92. Niall

    Just a quick comment on my experiences with a Precision single sided Ultegra unit – bought from Evans in the UK – went through the motions of fitting, updating firmware and calibrating – all went fine but when testing I saw no power readings – Cadence was fine over ANT+ and BLE but only very occasional sporadic single digit power numbers. Few days of email exchanges with Pearl at 4iiii support and despite some suggestions and things to try the issue couldn’t be resolved remotely. RMA Process started on a Thursday with prepaid Fedex documents emailed to me – Dropped off at Fedex on the Friday morning – transatlantic trip over the weekend and arrived with 4iiii on the Monday. Unit repaired and shipped by Friday, back with me on the Monday morning. Refitted to the bike and working fine now.

    Now obviously It would be great if the PM had worked out of the box but crap happens and as far as service and support goes I am impressed by the way it was dealt with. Thanks Pearl!

  93. Michael Swann

    I bought one of these and have only had it a few weeks (bought through Clever Training using the DC Rainmaker discount code).

    I’ve noticed some rather large power and cadence spikes at times. They seem to occur when I stop pedalling to go over train tracks. On my normal route to work I go over train tracks on four separate occasions. I usually stand on the pedals with the crank level and my knees bent to absorb the vibration.

    Tonight I saw a spike of over 2000 Watts.I cleaned up the file with an online tool to remove the large spike, but I still have the original file if need be.

    Is there a trick to avoiding these spikes or is it an issue with my particular power meter? It’s running the latest firmware.

    • Chris

      Sounds like power meter is doing its job. It is seeing the shock going over the tracks if standing with crank horizontal to ground. Try putting the left crank at 6:00 and see what happens or put the left crank facing towards back of bike.

    • John

      You’re looking at a 3 second or 10 second average power, right? Instantaneous power numbers tend to not to be very useful…

    • 2,000w is definitely odd though, filtering should be taking care of that. I’d reach out to 4iiii and send them the files to see what they think.

    • Michael Swann

      I wasn’t looking at the numbers when I was riding. I didn’t see the peak until I reviewed the data after upload to Garmin Connect. The peak showed up also on Sport Tracks and Training Peaks. Strava filtered it out.

      Strava also filtered out the wonky speed data that I got from my Wahoo RPM Speed Sensor as well. The speed sensor is a separate issue. I don’t think I really need it as the GPS data from my Garmin is better than the data I was getting from either of the Polar devices I owned, which was why I put the speed sensor on in the first place.

      I will follow up with 4iiii and see what they say.

      As for trying other positions, that will have to wait till the next time I ride to work, which will be next week some time. Standing and putting the left crank at 6:00 sounds like the way to go, puts all the load in the crank purely in tension.

    • Michael Swann

      I received a response from 4iiii. Apparently what I’m seeing is a known issue and is to be addressed in the next firmware update to the Precision.

  94. Roger

    How are people finding the battery life on 2nd gen? I got my first low battery warning yesterday, the app says 8% left and I’ve only done 58 hours on it, a little less than half the quoted 120 hours. Am using the standard panasonic battery that came in the box.

    • Jacky Wong

      Same here, I replaced the battery yesterday(the spare battery in the box). And I found it shows 50% full.

    • dennis

      Hi Jacky,

      Did you click on forget the device before re- pairing the pod with the new battery? i read it somewhere that it automatically shows 50% if you put a new battery but keeping the same pod paired

    • Jacky Wong

      Oh I see, let me try when I arrived home.
      Thanks.

    • Pearl

      Hello Roger
      This is a known bug with firmware 2.0.0. We are working this and are close to a solution. The readout is not reflecting your true battery status – it actually isn’t draining at that rate. However you need to override the reader status by taking out your battery and reinserting at the start of your ride. This is a temporary workaround and we will have a firmware update in the app stores soon. Thanks for your patience!

    • Roger

      Thanks Pearl. That makes sense as I’m sure I was > 50% remaining a couple of weeks ago before the firmware update. I’ll put my bulk purchase of cr2032 batteries on hold!

    • Bogy

      I just bought a 4iiii Precision Power meter and I am planning to use it with my iPhone. Can anyone share what ios app is best at recording both the power and cadence data from the device?
      Thanks!

    • Eric

      It works fine with Strava and many more. But instead of a Smartphone-App, I use most of the time a cycle computer like the Garmin Edge 520.

    • Bogy

      Strava app does not work well with the 4iii Precision Powermeter. First it does not report cadence. Second, on the devices screen it shows Power in rpm and during a ride the reported power is not accurate so it is either calculating it based on cadence or it is reporting cadence as power.

    • Roger

      I’ve had no problem pairing 4iiii with Strava on Android, using ANT+. Cadence works as expected and power looks pretty much the same as it does on a Garmin recorded ride. I keep my phone in my pocket so I can’t comment on how it looks during the ride, but the saved ride after has everything you’d see when pairing to another device.

    • 4iiii Innovations

      Please pair PRECISION with the 4iiii app and enable 3rd Party Compatibility Mode. Your Android device needs to support Bluetooth 4.0 or higher.

    • Bogy

      I did pair mine through the app (I am using iPhone 6) and it works great with Cyclemeter, Zwift and other 3rd party apps. The only issue seems to be with the Strava app. I submitted a Support Ticket with them to see if they have any suggestions.

    • Bogy

      After a few back and forth emails with the Strava support team they were able to recreate the issue that I have with the Precision Power meter when using the app and Bluetooth. They acknowledged it was a bug. They said they will address it in the future updates (hopefully soon). They also said that although the cadence is not shown on the main screen it is recorded by the app and can be seen when you upload the session to Strava website.

  95. ekutter

    I’m considering getting the 4iiii left only PM. I have DA 9000. Is there any benefit to buying it with the crank arm for $599 (minus 10%) vs sending in my own crank arm for $399 (plus $41.94 shipping to Oregon – yikes)? Would I expect identical accuracy?

    Also, do you know if they have any plans for SRAM XX1 Eagle on the mountain bike side?

    • John

      I think for most people it comes down to whether or not they would be without the use of their only bike while their existing crank arm was off to 4iiii being retrofit.

    • John

      Of course at the 105 level, the price is the same so there’s almost no reason not to get the Ride Ready version…

  96. Dennis

    Thanks for keeping this thread running.
    Been using mine for 11-12 weeks now – have been getting low power readings which I thought might just have been fitness related. Did all the good stuff before each ride – on my head units, started with the 920 and went to the edge 500. I would also calibrate via the app and trainerroad. This week the update came out, updated the pod and then road the trainer without thinking about the update, I did notice my power was higher than the previous ride this week. anyone had the same thing happen to them recently?

  97. Mark

    Anybody know what the latest 2.1 firmware for the 4iiii does? I’ve got the 105 crank and very impressed so far. I had a slight issue with power dropping out when climbing with a slow cadence and high power. I paired with the Android app and the issue seems to gone.

    • Dennis

      From Pearl
      The firmware update (version 2.1.0) includes bug fixes and improvements that provide more reliable power data in some riding conditions. In addition, battery reporting has been adjusted on both the firmware and the iOS 4iiii App (version 1.24.0) to provide a low battery warning when there is 10% of battery life remaining (compared to 8% in version 2.0.0).

  98. MARK HILL

    Thanks

  99. Steve D

    Just ordered a 4iii, 105, left side only through clevertraining so Ray can eat and keep making awesome reviews. I’ve got a powertap hub and am anxious to see if my previous PT data will essentially be useless when compared to a left side only. I’ll do a bunch of same bike tests and report back. If it’s way off I may return the precision and get the dual sided version. Also seen nothing about the lezyne computers and the 4iii so hopefully that works without issue.

    • Pearl

      Hi Steve
      I’d advise you contact Clever Training to verify their return policy. Cranks that have been used cannot be resold. You can, however, always upgrade by adding on the right side FC-9000.

    • Steve D

      Shoot, I didn’t realize that. I don’t have dura-ace cranks so upgrading to the dual sided is not really an economic option. I took the precision and the powertap on an indoors rollers ride yesterday and was less than pleased. It may be just the reality of left-side only, or because I didn’t let the precision settle before calibrating it, but the precision generally read low, sometimes 10 watts, but sometimes 25 watts. I saw generally because the precision was around 3% lower than the powertap, but on one 2 minute interval it was only .5% lower. I would expect it to be the other way around, given that the PT hub is farther from my foot. I also could not set the crank length and calibrate with ANT+ on my lezyne enhanced super gps. I used bluetooth instead.

    • Steven D

      After a dozen rides with the Precision, I’m very pleased. By fiddling with the offset values after about every ride through trial and error (my left leg is pretty consistently 1-1.5% weaker than my right) I was able to get the precision to track within 1% of my powertap across easy and hard efforts, and sprinting/climbing is consistent too. If I consciously try and flick my left leg down, the precision will read higher, but that’s a reality of left side only power measuring.

  100. asimon

    After reading that the battery reporting was updated in the 2.1 firmware update, I went into my box of used 4iii batteries and reinstalled one. (i changed them out @ 5%~1% remaining battery life) The original battery that came with the unit is still working 27 hours in.

    Reinserting the battery will display 50% remaining life and subsequent rides will show 0%. Power data is consistent compared with a full battery.

    • Dennis

      Safe to say you clicked on forget the device before putting the new battery in then pair it again with the app. Mine showed the same % before.

    • Roger

      Is anyone getting close to the 120 hours advertised battery life? I got 60 hours on my first battery, and now have had to replace the next one after just 40 hours. I replace them at 1% so I can’t imagine there’s much juice left in them.

  101. Arran

    I recently got the Ultegra 6800 precision, whilst I’ve never used power before it’s nice to see a power number now.
    However I am getting some strange readings, like when I am pulling off at a junction and give a little bit of grunt, I’m them registering 160+ cadence and 1,300w+.
    Clearly I’m not achieving these numbers…so I have no idea why it’s glitching. It does it an awful lot when I am pulling away from junctions.
    I’ve emailed 4iiii about it, however haven’t received anything back from them yet, but hit record cadence and power today whilst at about 0.9mph!

    • Have you tried doing re-doing a zero-offset (aka calibration)? Almost sounds a little like perhaps during a previous calibration there might have been load applied to the pedals.

    • Arran

      Trouble is I am re-calibrating it before every ride, as I have the Garmin prompting me.
      Always reports Successful and 0 torque on the crank arm.

      Checked and double checked the firmware, on 2.1.0.

      I wasn’t aware of the funky power numbers before, was just concerned by it giving me at a minimum 140 cadence each ride, but today giving me 1377w and 164 cadence…just sounds barmy.

    • dennis

      Happened to me as well on my first ride out on a 1000+ watt output, if i am riding outside, i calibrate via my garmin and also via the app – have not had any instances since.

    • Arran

      Unfortunately I have got super high cadence when calibrating with the app or with the Garmin.
      Shouldn’t really be due to any big temperature shift, as it’s cold in my garage and cold outside…!
      Guess it’s a wait for 4iiii to get back to me.

    • Agree, sounds like something else is amiss. Usually 4iiii responds pretty quickly. They’re located just outside of Calgary, so probably another 6-8 hours before they’re in the office today.

    • Pearl

      Hi Arran
      Our support team is on it! Typical response time is 24 hours.

    • Arran Jacobs

      4iiii have advised to return to the place I purchased it under warranty.

      So now have to jump through the hoops of the ProBikeKit warranty procedure.

      Definitely something up with the unlit, was reporting 138 cadence at 0 watts, then 0 cadence at 0 watts, then 85 cadence at 0 watts for about 150m.
      I’m presuming it’s just a bad unit that I’ve received, hopefully get a perfect one next time :)

      Now to go jump through some hoops…

      No Zwift for the next week or two :(

    • Arran

      Got my replacement unit today, so hopefully test it next week!
      Will report back my findings, hoping it doesn’t give me the same crazy readings!!

  102. Paul

    Hi,

    Thanks for the extensive review, great stuff!

    Any chance that the coupon code for clever training will be made available again soon?

    It seems to be expired.

    Thanks,

  103. Arran

    Back again!

    Sent my 4iiii back under warranty, and received a new unit.

    I have the same issue…
    Prime example today –

    Halfway through my commute, stop at the top of a small hill to adjust my shorts.
    Pulled away from the kerb and all seems fine about 890W and about 86 cadence whilst pulling away, completely normal…

    Then I can only decipher that when I then get back in the saddle and stop putting down power, power goes down to like 70w when going from standing to sitting, but cadence seems to double and go to 140 – 160.

    Then power and cadence normalize to around 180w and 95 rpm….

    It’s as if the unit just goes mental whenever you freewheel for a second?

    Looks pretty buggy to me….

    • Bogy

      If you freewheel it is normal for the power to show a sudden decrease and for the cadence to go up: it’s what actually happens, you apply almost no force on the pedal while you spin very fast. If you want more normalized values displayed for the power you can set your device to show the average power over 5 seconds or more (depends on what you use to display the power, some apps don’t allow you to do that). I don’t think it’s a bug, it sounds like normal values to me.
      I hope this helps.

    • Arran

      I think you misunderstand…
      My cadence is never 150 – 160 (hell I’d know if I was doing that kind of cadence), and transitioning between standing and sitting my legs would slow down rather than speed up…and it’s around that time that it’s malfunctioning.

    • Arran

      Ok, so received a response from Pearl at 4iiii. Not exactly a positive one either:

      1) There is a known cadence spike issue
      2) It’s doubtful it will be fixed in the next 6 months
      3) It’s software related the more prevalent in some head units / watches
      4) Can’t advise what head units / watches it’s more prevalent in
      5) Try a different head unit…..

      So all in all, It’s a known issue, fix in the next 6 months is unlikely, go buy a new Garmin – you might be lucky enough to select a head unit that it’s not a problem on….

      Well I am probably going to return the 4iiii and go with another brand now, as that response in my eyes is not really acceptable for a unit costing £469.

    • Philip

      What head unit are you using?

  104. Hi Arran,

    Thanks for supporting 4iiii through your purchase. I’m the product manager for our PRECISION line of products.

    We have been running the same production firmware across all our Pro Tour teams and sponsored athletes over the last 6 months and have not received any complaints of cadence spikes from our teams and athletes. Currently, our UCI World Tour teams are using their PRECISION PRO powermeters with Garmin Edge 520 bike computers.

    Internally, for ANT+ testing, we use a wide range of bike computers including the last two generations of Garmin bike computers such as the Edge 510, Edge 520, Edge 1000, and Edge 810. Based on our testing of the current production firmware (version 2.1.0) and day-to-day usage, we have not observed issues related to cadence spikes. However, we have observed cadence spikes when testing with older generations of Garmin bike computers.

    We always value feedback from our customers. To this end, we are happy to work with you to resolve the issues you through our customer support. As part of this process, it would be most helpful for us to know what bike computer(s) you are using for which you are seeing this problem.

    Sincerely,
    Billy Chan

    Product Manager

  105. Brad

    I received and installed my Precision 105 5800 today.

    Upgrade firmware? Check.
    Calibrate/zero? Check.
    Works nicely? Fail.

    Unfortunately the power reading is around a factor of 10 out – 20W when I know the gear/cadence combo I’m using on my turbo normally gives around 200W (measured with a Stages G2).

    Anyone else seen similar problems and if so did you manage to resolve it and how?

  106. Cristi

    Just got a Shimano 105 unit for my wife & when I shake it it rattles like something’s loose inside it (link to youtu.be). I’ve removed the battery and the cover and they’re not to blame. It’s also definitely not the screws or the locking part. Did anyone notice that kind of a sound ?

  107. Adrián Chapela

    Hi,

    What about Sram X9 BB30 crank?

    Do you know if there is any plan?