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SIGMA ROX 12.0 Sport Cycling GPS In-Depth Review


I can hear you already: What the fudge is the SIGMA ROX?

But here, let me make it simple for you: This is the most complete cycling computer to challenge Garmin’s higher end mapping devices yet. End of story.

Of course, the long story is much…much longer. So long in fact that I first used a unit on rides back last December, then again this winter, and then consistently for the past two months.  Almost all my rides have been with it, even if just barely out of sight from my regular pictures and videos.

So how’s it the most viable competitor? You mean aside from having full-color touchscreen mapping that’s actually fast and responsive while zooming around?  Or were you talking about the sensor support for all the major sensors types?  Perhaps it was the full Strava Live Segments integration or the support for WiFi sync of Strava, Training Peaks, and Komoot platform data like routes, and on-unit workouts.  Did I mention that it comes with any map set you want in the world, free of charge?

Of course, it’s not without its quirks.  There is no silver bullet here.  I’ll dive into both the pros and the cons of this device through the review.  The point of my intro paragraph is more simplistic: Don’t dismiss the unit based on the company’s long history of putting out boring head units.  They got the memo (from me and everyone else).  And apparently they also even read the memo we, as the collective Internet of cyclists, sent.  The SIGMA ROX 12 is what came of it.

(Note: I was sent a loaner ROX 12 unit to poke at. Actually, I used multiple loaners over the last 7 months.  All of which I’ll soon be sending back to SIGMA like I always do with other companies.)


Like most cycling computers, there are two purchasable variants of the SIGMA ROX 12 kit.  One is just the standalone unit, while the other is a full bundle with extra sensors and such.  In this case, I’m unboxing the bundle variant.  So if you don’t have the bundle you won’t get the heart rate sensors and speed/cadence sensors.  No worries though, it’s compatible with any ANT+ sensors (Bluetooth Smart sensors are coming), and on the mount side, any Garmin quarter-turn mount too.  So basically, between those two…pretty much everything from anyone is compatible.

In any case, here’s the front and back of the box:

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Once you remove the outer shell, you can part the Red Sea and find the ROX 12 sitting inside:


We’ll skip ahead to me getting all the parts out on the table and well-organized.  A process that probably took longer than drinking a cup of coffee:


Here, I’ll help explain everything.  First, in the lower left side, we’ve got the various sensors.  This includes a combo speed/cadence sensor and the heart rate strap.  Both of these are dual ANT+/Bluetooth Smart.


Next, there’s the Barfly out-front mount (with SIGMA branding), that’s in base and bundle kits.  What’s super cool here (aside from them partnering with Barfly/Tate Labs on this), is that they actually give you the GoPro underside mount.  Every other company that does out-front mounts cheap out on this tiny bit of plastic and doesn’t include it, pressing you to spend some crazy amount of money for something that costs a few quarters.  Kudos to them for including this in BOTH the base and bundle kits.

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You’ve also got the standard handlebar/stem mounts (two of them):


These are almost identical to the Garmin quarter-turn mounts.  From a compatibility standpoint they are, but SIGMA did a few minor tweaks to increase solidity on them so they are a bit firmer in there.  I’ve been using the ROX 12 though with all sorts of Garmin mounts with zero issues.

Next, we’ve got the micro-USB cable.  I know, geeks everywhere just sighed and hoped for a USB-C cable. Not today folks, not today.


Oh, then there’s the unit itself.  Fear not, there will be plenty of photos of the unit throughout this post:


Finally, there’s the manual and a paper note letting you know about the apps.  We’ll talk more about that later.  I thought the little table of ranges and performance was kinda neat though. Very German. 🙂

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Next, a super quick look at size and weight compared to some other popular units:


Left to right: SIGMA ROX 12, Garmin Edge 1030, Hammerhead Karoo, Wahoo ELEMNT, Garmin Edge 520/520 Plus, Wahoo ELEMNT BOLT, Polar M450/460


And the weight comes in at 125g:


The others weighed in at:

Hammerhead Karoo: 186g
SIGMA ROX 12.0 SPORT: 125g
Garmin Edge 1030: 124g
Wahoo ELEMNT: 103g
Wahoo ELEMNT BOLT: 61g
Garmin Edge 520/520 Plus: 60g
Polar M450/460 (non-mapping): 52g

Finally, for lack of anywhere else to plop it, note that the ROX 12 actually has swappable back cases, like this:

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You can remove the black shell and easily swap it for other colors.  Kinda neat if you want to match your bike.  I suppose you could even buy an extra shell and then paint/decorate it yourself.

The Basics:


As noted earlier on, the Sigma ROX 12 is a fully touch-screen equipped device, akin to that of a mobile phone.  That’s because under the covers, that’s exactly what it is: An Android device.  Which doesn’t mean you should get grand visions of running Snapchat on the unit…at least not yet.  It’s a moderately locked down version, so you can’t just tap an icon to access the app store, at least not yet.  The vision Sigma has is roughly half-way between that of competitor Hammerhead with their highly customized and locked down Karoo, versus that of an off-the-shelf Android phone.

More importantly, none of this really matters to 98% of folks out there.  If you have an iPhone or an Android phone or no phone at all, there’s no difference.  That’s because Sigma doesn’t have any direct connection between your phone and the ROX 12.  They operate independently of each other (for better or worse).

So let’s start with the basics.  After powering it on and completing some basic setup questions, you’ll be brought to the dashboard.  Along the way, within setup, you’d have also configured WiFi on the unit.  That’s the primary way you’d get data off of it.  It doesn’t have a Bluetooth Smart connection to upload via phone.  Instead, it’s WiFi or USB for any data offloading or communications.  It’s also how you download maps, routes, and upload activities.


The next thing you’re likely to want to do is to setup 3rd party services.  Out of the box the company has Strava, TrainingPeaks, GPSies, and Komoot support.  This means you can do everything from download and ride Strava Routes, to compete on Strava Live Segments, as well as upload workouts to TrainingPeaks (not yet pull them in from TrainingPeaks).  Same goes for routes from Komoot and GPSies.  Essentially, this puts them on roughly equal footing to Wahoo and Garmin in terms of ingest of data, though slightly below those competitors in terms of export of data (meaning: Garmin/Wahoo have more data sync partners at this time, though I expect that’ll change quickly).

After that’s all done you’ll probably want to pair sensors.  You can pair and store ANT+ & Bluetooth Smart sensors.  The following sensor types are supported:

– ANT+ Cycling Speed-only
– ANT+ Cycling Cadence
– ANT+ Cycling Speed & Cadence Combo
– ANT+ Heart Rate
– ANT+ Power Meter
– ANT ROTOR Power Meter (advanced data view, including OCA/OCP data)
– ANT+ Cycling Gear Shifting (SRAM RED eTAP, Campagnolo EPS, FSA)
– ANT Shimano Di2 Gear Shifting

Like most options on the market these days, you can store multiple sensors of the same type as well.  Convenient if you have multiple bikes.  And like other companies, Sigma has sidestepping having specific ‘bikes’ in terms of settings, instead focusing on sport profiles (similar to Garmin).  This means you can customize a swath of settings for different situations (indoor cycling, road cycling, mountain biking, etc…), and then it’ll automatically find the sensors for your bike when you start up.  If more than one sensor type is in range when you start it’ll ask you which one to use.

Note that I don’t currently have a ROTOR unit in my stockpile to test, but, I thought it was notable that they are showing ROTOR’s advanced metrics in their head unit.  That’s cool cross-manufacturer collaboration where the ANT+ spec doesn’t cover them yet.  Here’s what that should look like according to their marketing page:


You’ve also got all the options you’d expect for looking at sensor details and setting a zero offset on your power meter.

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One of the things you’ll probably notice sooner rather than later is that sometimes the precise wording the company uses isn’t 100% natural to native English speakers.  They’ve done some good work on this since last December on my first ride with it, but there are still occasional nuances to this.  Part of this likely comes from being Germany based as opposed to US/UK/etc based.  But I suspect another portion of this is actually just them trying not to copy the exact wording of their competitors for certain functions.  Unfortunately, that slightly increases confusion because we’re largely accustomed to calling certain things by certain names.  For example, ‘cubes’, which means ‘data fields’.  Or in intervals, ‘phases’, which means…well…intervals.

Native English speakers will understand roughly what to do here, but the linguistics of it isn’t quite perfect.


The interface itself is heavily touchscreen, but also has buttons for confirmation and up/down style navigation.  On the upper right side is a dedicated power button, while the lower half of each side has buttons that can be used for changing the data pages.  Meanwhile, across the bottom, there are dedicated stop, start/lap, and home buttons.  All of which worked with gloves for me this past winter.  Similarly, the touchscreen did work with gloves for me too.


As for rain?  The final unit I received has worked without issue in the seemingly always-present Dutch rain.  However, some earlier pre-production units were more troublesome.  Sigma says they’ve addressed that, and that certainly seems to be the case.  Still, I mention this because the only proof here will be lots of users having no issues.  I base this on Garmin’s Edge 820 touchscreen woes, which can be heavily attributed to manufacturing quality control issues on the screen layering itself.  Hence why one person would have no issues, and the next person wanted to swing a crankset to their own head.  Said another way: This unit is working great for me now – but let’s not count the chickens till a few months from now.

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Turning to settings for a moment, you’ve got pretty much everything you’d expect to find on a high-end Garmin unit here as well.  From backlight timeouts and color modes, to sleep timeouts and altimeter calibration.  Imperial/Metric toggles, languages, map customization and management, and sport profile configuration, and crap-tons more.  I dig into these settings in a bit more detail within the video linked in this post.

In any event, let’s head out for a ride to cover the basics.  The first thing you’ll want to do is decide which sport profile it is that you’re using.  By default, it’ll be the Road Bike profile (RDB), but you can change that easily by just tapping ‘Sport Profiles’.  Up top it’ll specify which one it is:


Next, tap that big section up top where it says ‘RDB’ to get going.  This brings you to the main screen where it’s going to start finding satellites and such.  If you want to enable/disable/tweak sensors or calibrate the compass or elevation, you can just swipe-down from the top to quick-access a slew of settings:


Otherwise, you can just press the lower right start button to begin recording:


At this point, it’s recording just like any other head unit.  You can swipe left and right on the screen to change data pages, or press the left/right buttons on either side of the unit to accomplish the same. Below I’m using my thumb to scroll through by swiping.


Whereas here I’m simply pressing the left side button to iterate through the pages.


There’s tons of customization of these data pages, either directly on the unit itself or via the desktop app.  You can also change any data field at any time by just long-holding that data field to bring up choices for other data fields:

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The number of layouts is impressive as well. What you see below is one layout where the map will actually be that tall block on the right, so you can see the part of the road you care about just ahead, and ignore all the other junk you don’t care about on the side.


At this point, everything works pretty much as you’d expect for the basics.  Sensor data displays and records, maps are shown by default (more on navigating later in the review), and elevation charts plot too.  Again, it just works.

There is a gap though: Smartphone integration.

There’s currently no integration at all.  Meaning, no smartphone notifications of text messages or incoming calls, nor any other way to directly have the unit talk to your phone.  The company does have a smartphone app for viewing rides and such, but that requires that the unit upload the data first via WiFi.  This also means that there’s no live tracking or the like for the unit either.  And before you ask, no, it doesn’t have a SIM card slot.

The ROX 12 supports the creation and execution of interval workouts, built on the device itself.  You’ll start by specifying whether you want a simple goal (which they call ‘Phase’), or a more complex interval workout:


If we choose the second option, we can specify a given target zone (heart rate, cadence, power, %HRmax), the reps, the recovery duration, and the reps.  You can build these out independently though to actually put together some surprisingly complex workouts.


You can keep adding chunks to the workouts as well, albeit there appears to be some minor quirks in adding things like recovery bits where you need to add those first and then specify the work effort portion, else the recovery wipes out the specified work portion.  Same goes for inability to use the space bar in between words. Minor bugs I’m sure they’ll fix.


Out on the road (or the trainer), the unit will give you details on each section you’re in and how far to go in each section.  Again, all pretty impressive for a new unit at this point.


Once your ride is complete, you’ll go ahead and hit the stop button and then re-confirm again to end the ride.

At this point, the ride is available to sync via WiFi the next time you’re connected and press to sync.  In theory, it’s supposed to sync automatically when in range of WiFi, but I found a few cases where that didn’t happen and I had to manually press to sync.


Now you may have noticed the ‘Sigma Cloud’ option within the unit.  That ties up to Sigma’s Cloud service.  Now, don’t get visions of an elaborate platform like Garmin/Suunto/Polar/Fitbit.  Instead, this is as 1980’s as you get.  It’s basically just a repository for data so that their Data Center app can access the data.  That app is located on your desktop or mobile phone (where it’s called Sigma Link there, but it doesn’t seem to work with the ROX 12 yet).  Essentially think of the Sigma Cloud service as a roundabout interchange for data.  It’s not really somewhere where you want to hang-out, but is important nonetheless.  Just to exemplify what I mean, here’s what it looks like:


Yup, that’s it.  The ‘My Data’ tab merely shows my e-mail and name, and the ‘Contact’ tab has a form to contact them.

Meanwhile, here’s the exponentially more capable Sigma Data Center software:


Within this software, you can access data synced via WiFi to/from the Sigma Cloud, or you can also access the ROX 12 via USB cable too.  This allows you to analyze rides and do longer term reporting and analysis on your trends.


You can also configure additional sharing connections here, including 2Peak and Facebook/Twitter:


In fact, you can even customize all of your sport profiles and data pages here if you’d like.

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All of this is pretty impressive.  And here’s the thing you have to keep remembering with Sigma: This isn’t their first barbeque.  They’ve been making sport GPS devices for years, both cycling and running.  It’s just that till now you probably ignored them because they were clunky and felt dated.  While some of the cloud pieces may still feel a bit that way, the underlying data and cycling concepts are well flushed out by now.

That’s a core difference when you compare to new entrants like Hammerhead and their Karoo.  They’re having to deal with the death by a thousand cuts paradigm because they don’t have years of users and data experience behind them.  For example, their latest firmware update last week addressed issues with two (fairly major) types of ANT+ power meters and how those power meters chat.  That’s a perfect example of something Sigma has long ago had to deal with (years ago), and thus doesn’t have to reinvent the wheel there.

Which isn’t to say that Sigma or their ROX 12 is perfect. But to point out that don’t lump them in the same group of up and coming entrants just because this may be the first time you’ve heard of them.  If for no other reason than for at least half a decade the company has been at events like Eurobike, Interbike, and the ANT+ Symposium – trying to find just the right piece of hardware to get that viral unit like Wahoo got with their BOLT.  I think they finally found it with the ROX 12.

Mapping & Navigation:


Of course, a big part of why you’d buy the ROX 12 over other less expensive cycling computers is the navigation.  So, let’s dive into that for a bit.  The ROX 12 comes with maps for the region you bought it in (i.e., Europe, North America, etc…), and then easily downloadable maps for other regions (for free).  This is akin to Hammerhead and Wahoo, but unlike Garmin, which frustratingly makes you either pay for other regions or forces you to 3rd party sites to download the maps.

For example, the unit had pre-loaded maps for Italy, Netherlands, and France – all countries in my ‘region’.  But when I traveled to the US a month or so ago, I needed to download those maps.  But that’s easy once connected to WiFi.  Just tap through the menu for the area you need and you’re done a few minutes later:

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These maps are of higher level than something like a Wahoo ELEMNT/BOLT, the Hammerhead Karoo, or the Edge 520 Plus – that’s because they contain not just address information but also POI (Point of Interest) information, so that includes things like bike shops and restaurants.  Only Garmin’s higher end Edge 820 and 1030 units have the full set of capabilities as well.

On the ROX 12, you can enable/disable POI display however within the settings.  This is also where you can tweak other map-related settings too:


Also note that individual sport profiles also have additional map routing options you can configure:


Next you’ve got basically a few core ways you can navigate on the ROX 12.  They are:

– Specify a street address
– Search for POI (i.e., bike shops)
– Draw a route
– Tap a point on the map
– Pull from favorites (saved locations)
– Follow Sigma Cloud tracks
– Follow a past activity
– Download a route from Strava, Komoot, GPSies
– Specify GPS coordinates

Yes, really. There are that many options.  Any more options and Google Maps would probably be getting self-conscious.

In my case, I tended to use routes from Strava, merely because it’s where I’ve centralized most of my route creation.  This way I can easily use my routes with devices from all manufacturers – Garmin, Wahoo, Hammerhead, Sigma and probably others I’m forgetting.

To grab Strava routes you’ll have wanted to previously linked your unit with Strava’s service.  Once that’s done you’ll crack open the ‘Strava’ tab on the interface, which brings you here:


This is where you can look at Strava Routes or Strava Segments.  All of your routes are synced to the device, and can be used offline anytime.  It shows the name, route distance, and how far the starting point is from you.


What’s really cool is the display options here.  If you have a lot of routes like me you can choose how to sort them, such as by distance or name.  This is helpful because my route naming standard is of low quality.  I tend to have like 32 different routes named ‘Amsterdam South’, rather than being more descriptive.  But this way I can sort by the distance, which is usually how I narrow down routes for how far I want to ride that day.


If you tap on a route you’ll get the overview of the route on the map.  You can also do cool things like instantly reverse the route if you want to.

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Virtually everything I’ve shown here also applies to the other mapping options in terms of sorting and such.  Same goes for what I’m about to show in terms of actual routing.  Next, you’ll hit ‘Select’ to load the course up.  At this point you can select to route to the starting point if you want, or route to the nearest point on the course.  Then you tap ‘Start’.


Beware though that pressing start here doesn’t actually start the recording on the unit.  Instead, you have to press the physical start button in the lower right corner.  You’ll hear a little chirp sound, and now the unit is actually recording.  This is confusing, and something you’ll want to be aware of.

Once you’re up and going you’ve got a few different ways you can see and be notified of turns.  First is to stay on the various map pages.


As you approach a turn it shows you the upcoming turn on the upper portion of the screen, as well as zooms in the map.

Here’s the thing that’s hard to convey in text: Responsiveness.

The ROX 12 responds just as fast as your cell phone does when it comes to you interacting with the map. When you move around in the maps, it’s instant. It redraws into more detail in the blink of an eye as I zoom in, complete with all the water and road features around you. It doesn’t spend time re-drawing the maps or pondering life as Garmin Edge computers do. I can scroll around and everything happens as far as my fingers can work. I’ve gotta video coming up shortly that’ll detail this in a more visual way. Hang tight!


Like other computers, even if you’re on a data page dedicated to metrics (and not maps), you’ll get pop-up warnings of upcoming turns as you approach them:


Overall this works fairly well, I’ve never had a warning be missed.  In fact, the inverse is true – I’ve occasionally had too many warnings.  Like other GPS systems sometimes you get warnings for turns that don’t exist, usually when a road name or trail name quietly changes.  However, I find that in general Sigma does it far more than Garmin or Wahoo.  In talking to Sigma about it, they’re aware of the issues and have been working to minimize ghost turn notifications (they always say to keep going, so fear not, they aren’t telling you to turn somewhere you’re not supposed to).  These notifications have reduced over the time I’ve used the unit, so it seems like they’re making progress here – but it’s still something to be mindful of.

The other minor thing to know is that when you stop at a light or such, the current heading/direction of travel seems to be lost.  Meaning, it forgets that you were heading east, and the map rotates a bit while at a standstill.  It doesn’t trigger anything on the unit, but it can be confusing when you’re potentially making a turn immediately after the light as to which direction that turn is if the map rotated during your stoppage.  Hopefully, this is a minor thing to address though.

Ultimately, I’ve successfully routed on numerous trips with the ROX 12 over the last few months, all without issue.  The only other downside to the routing piece just comes from the lack of Bluetooth phone integration in that you can’t transfer routes via phone, only WiFi.  Sure, many people can create a hotspot on their phone via WiFi, but not everyone.  So if you’re one of those lacking WiFi hot spotting, just be aware of this limitation before you head out the front door.

Strava & Apps:


The ROX 12 supports certain 3rd party integration, which at the moment come from Strava, TrainingPeaks, Komoot, and GPSies.  Also, via their desktop SIGMA Data Center app they can sync to 2Peak.  On the unit itself, at this time these integrations are developed by Sigma themselves (rather than the 3rd party).  For each of these, you authenticate to the 3rd party app like you would most other online sites and then once authorized you’re able to access those platforms via the ROX 12 without further prompts.


In the case of Strava for example, the integration covers both routes (as I outlined in the previous section), as well as Strava Live Segments.  Like other platforms the Strava Segment will appear as you approach it for those that are favorited segments, and then give you status information throughout it:


You can dig into a given Segment, see where it is on the map (instantly, no delay), as well as the KOM leaderboard:

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In the case of TrainingPeaks, it’s just uploading workouts to them, they don’t yet have in place the ability to execute structured workouts from the TrainingPeaks platform.  Given Sigma already has structured workout support on the unit itself, hopefully we’ll see them start to support TrainingPeaks workouts soon.


I didn’t spend much time with Komoot or GPSies, but they’re both routing-focused.  And of course, both are popular with various groups/regions.

When it comes to data sync to other platforms, that happens from the unit itself for the previously mentioned platforms.  However, SIGMA can also sync via the Data Center desktop/mobile apps, and even in theory via their SIGMA Cloud platform.  Right now though you don’t configure anything via SIGMA Cloud in terms of 3rd party apps.  But I’d see that as the most logical way for them to quickly add other 3rd parties (for example entities like SportsTracks, MapMyFitness, Today’s Plan, etc…).  Hopefully, we’ll see more of that soon.

The bigger question I suspect many people are asking is whether or not SIGMA plans to open up their Android platform to 3rd party apps.  And at present, the answer is a bit of a wishy-washy ‘kinda’.  They see good opportunities for 3rd parties to more easily port their existing Android apps to run on the ROX 12, rather than straight-up enable support for any Android app altogether.

To me, that’s logical.  As much as people think they want blanket access to the Android app store, in reality that doesn’t really work as well as folks want it to.  For example, there’s no headphone jack on this device for access to music, nor a camera for that either.  Also, finding a way to make the interaction seamless between the SIGMA side of the house and an Android base platform is tricky.  After all, there are plenty of far cheaper and more capable Android phones if all you want is an Android phone on your handlebars.  True though, this does have ANT+ access on it as well as a touchscreen that actually works in the rain and with gloves.

It does sound like SIGMA is open though to trying to find the right middle-ground here.  They didn’t do some super over the top custom build of Android for their platform, which gives them more flexibility for both updates and 3rd party app developers.  We’ll have to see how this story plays out over the next year.

GPS & Elevation Accuracy:


So how does the unit track when it comes to accuracy? Overall, pretty darn solid.  We’ll look at some GPS tracks first, and then some elevation ones.  When it comes to GPS tracks I’m comparing against usually 2-5 other GPS devices.  Some Garmin, some Fitbit, some Suunto, some not.  Just depends on what I’m testing at the time of that ride.  In the case of the ROX 12, I was using the GPS+GLONASS setting, which would drain battery a bit more than just straight GPS alone (but can give better GPS results in many cases).

Keep in mind that when looking at GPS tracks it’s important to usually use satellite view, since that most closely aligns to where the tracks are plotted.  Versus regular map view, which may not have bridges and water features perfectly the right size/width, so sometimes it can appear you’re in the drink when you’re not.

We’ll get right into things.  Now in some of these examples I can’t quite share all the other units I had with me on the bike/wrists since they’re unannounced. Fear not though, in any instances where there was disagreement I checked in on those tracks to see who the winner was.  Typically though, with road cycling it’s fairly rare these days to see broad screw-ups on GPS tracks (mountain biking is more common, but unfortunately I didn’t have any mountain biking during my time with the ROX 12).

In any case, first ride from a couple days ago in Italy on relatively meandering terrain.  Ups and downs, plenty of trees in some forested sections, and also the unit was hidden away in my back pocket.  So basically the worst possible conditions from a reception standpoint.  Here’s the overall route/track, my inability to navigate included:


As you can see at a high level, everything is basically spot-on. So I’m going to dive into the most heavily forested part and see how things look;


Above you can see the switchbacks going up a hill and the purple line of the SIGMA 12 nails it, even stuck in my jersey pocket.  It’s super solid.

At the top of that climb it does seem to struggle a little bit on a turn or two, but so does the Edge 520 Plus.  This was against a tall rock wall/cliff on one side of the road, so it’s understandable this would be more difficult:


The remainder of the ride was fairly normal and both units performed as one might expect.

Next, here’s a ride around the farmland south of Amsterdam.  In this case against an Edge 520 Plus (albeit one started a few minutes later, but that doesn’t impact the recorded track).  At a high level everything looks good:


As we dig into some of the turns, I’ll start by picking a tough spot near some tall buildings and then diving under an underpass.  It’s a good test of recovery of GPS signal once lost:


In this case above you can see on the left side that the Sigma in purple was actually a better track than the Edge 520 Plus.  Admittedly this particular ride was still on non-final Edge 520 Plus firmware, but just focusing on the SIGMA track, it looks super crispy here.

The same story is true of the river here, the Sigma is perfectly on-target.


I can’t find any part of this track where the SIGMA went off-course.  It was spot-on throughout.


Next, we’ve got another Amsterdam ride as I go on a bit of a meandering river ride.  It might be fun to start with the final distance numbers:


Note that on the average power numbers the units were using different settings for zero averaging, thus why those are different.

In any case, GPS tracks:


Let’s take a look at that same railroad turn that caused the Edge 520 Plus beta firmware some issues, and now compare it to the production firmware:


And now it’s spot-on.  Perfect from both units, really really perfect.  The rest of the ride is incredibly boring – everything is great.


And that’s basically the trend here if I pull open other GPS tracks as well from it, it’s spot-on in every condition I’ve ridden.  Now granted, these were super dense mountain bike trails, but usually some nice tall buildings like I rode past tend to at least challenge other bike computers.  Not so here.

So let’s take a crack at an elevation chart.  Looking at elevation charts near Amsterdam though is about as exciting as evaluating elevation on a pancake from IHOP.  For better or worse, the SIGMA 12 passes that with flying colors – they’re all flat – at least if you remember the entire scale on this is 18 meters.  The Sigma in purple had a total difference of 4m to 12m, which is about right as I ‘climbed’ up from the river over a large highway overpass at the end there which you can clearly see.  Thus, the only ‘hill’.


So let’s go back to Italy instead, where there were some legit hills.  This is Tuscany, so they are indeed hills, not mountains.  Still, at 200m of elevation gain, that’s respectable for a hill.


And we see the two units are very very close.  Without a reference altimeter reading from a known good quantity we have no way of knowing which one is absolutely correct, but they’re within a few meters.

If we look at the total ascent numbers, they’re also fairly close – about 17 meters off, but I suspect some of that may be settling (as we see a bit of drift over the course of the ride).


Again note that in the case of the average power the two units were doing different things for zero values.

In any case, insofar as road riding goes, I’m seeing really solid results from the SIGMA ROX 12, matching what I see from other head units, and more importantly – matching exactly where I went.  That’s somewhat the nice part about looking at GPS tracks of cycling computers on the road, it’s much easier to quickly determine how accurate a track is, since it’s unlikely you’d have gone off-roading (and if so, you’d remember it).

(Note: All of the charts in these accuracy portions were created using the DCR Analyzer tool.  It allows you to compare power meters/trainers, heart rate, cadence, speed/pace, GPS tracks and plenty more. You can use it as well for your own gadget comparisons, more details here.)

Product Comparison:

I’ve added the SIGMA ROX 12 into the product comparison tool, which allows you to compare it against other units I’ve reviewed.  In the case of the below charts, I’ve compared it against the Garmin Edge 1030, Edge 820, Wahoo ELEMNT, and Hammerhead Karoo.   You can, of course, compare it against other units within the product comparison tool though, just as easily.

The main mapping/navigational difference between the Edge 1030/820/Karoo/Sigma, and that of the ELEMNT/BOLT is that the Wahoo units can’t re-route you if you go off-course (they just point you back in the direction of the course).  Nor can those units (without the phone) do much in the way of routing to addresses, points of interest, etc… Essentially, with the Wahoo units, you need to know where you’re going before you leave the house.  The others you can decide when you mount your bike.  There’s obviously far more features than that, but that’s the 20-second elevator version.

Function/FeatureSIGMA ROX 12 SPORTGarmin Edge 1030Garmin Edge 820Hammerhead KarooWahoo ELEMNT
Copyright DC Rainmaker - Updated November 26th, 2018 @ 12:24 pmNew Window
Product Announcement DateJune 4th, 2018Aug 29th, 2017July 13th, 2016May 2nd, 2017Sept 15th, 2015
Actual Availability/Shipping DateJune 4th, 2018 (Europe), July 2018 (US/Global)Aug 29th, 2017Mid-July 2016Feb 9th, 2018March 1st, 2016
GPS Recording FunctionalityYesYesYesYesYes
Data TransferWiFi, USBUSB, Bluetooth, WiFiUSB, Bluetooth, WiFiWiFiBluetooth Smart, WiFi, USB
Battery Life (GPS)16 hours20 hours (+ battery pack up to 40 hours)15 hours10-15hrs17 Hours
Recording Interval1-second1-Second or Smart1-Second or Smart1-second1-Second
Satellite Pre-Loading via ComputerYesYEsYesYesYes
Quick Satellite ReceptionGreatYesYesYesYes
Backlight GreatnessGreatGreat (slightly less than Edge 1000, but better in daylight)GreatGreatGreat
Ability to download custom apps to unit/deviceNoYesYesIn futureNo
Acts as daily activity monitor (steps, etc...)NoNoNoN/AN/A
MusicSIGMA ROX 12 SPORTGarmin Edge 1030Garmin Edge 820Hammerhead KarooWahoo ELEMNT
Can control phone musicNoNoNoNoNo
Has music storage and playbackNoNoNoNoNo
Streaming ServicesNo
PaymentsSIGMA ROX 12 SPORTGarmin Edge 1030Garmin Edge 820Hammerhead KarooWahoo ELEMNT
Contactless-NFC PaymentsNo
ConnectivitySIGMA ROX 12 SPORTGarmin Edge 1030Garmin Edge 820Hammerhead KarooWahoo ELEMNT
Bluetooth Legacy (pre-4.0) to PhoneN/ANoNoNoNo
Bluetooth Smart (4.0+) to Phone UploadingNo (uses WiFi)YesYesNoYes
Phone Notifications to unit (i.e. texts/calls/etc...)NoYesYesNoYes
Live Tracking (streaming location to website)NoYesYesNoYes
Group trackingNoYesYesNoYes
Emergency/SOS Message Notification (from watch to contacts)NoYesYesNoNo
Built-in cellular chip (no phone required)NoNoNoYes (with SIM card added)No
CyclingSIGMA ROX 12 SPORTGarmin Edge 1030Garmin Edge 820Hammerhead KarooWahoo ELEMNT
Designed for cyclingYesYesYesYesYes
Power Meter CapableYesYEsYEsYesYes
Power Meter Configuration/Calibration OptionsYEsYEsYesNoYes
Power Meter TSS/NP/IFYEsYEsYesYesYes
Speed/Cadence Sensor CapableYesYEsYesYesYes
Strava segments live on deviceYesYEsYesNoYes
Crash detectionNoYesYesNoNo
RunningSIGMA ROX 12 SPORTGarmin Edge 1030Garmin Edge 820Hammerhead KarooWahoo ELEMNT
Designed for runningNoNoNoNoNo
VO2Max EstimationN/AN/A(Cycling Yes though)(No for cycling too)N/A
Recovery AdvisorN/AN/A(Cycling Yes Though)(No for cycling too)N/A
TriathlonSIGMA ROX 12 SPORTGarmin Edge 1030Garmin Edge 820Hammerhead KarooWahoo ELEMNT
Designed for triathlonNoNoNoNoNo
WorkoutsSIGMA ROX 12 SPORTGarmin Edge 1030Garmin Edge 820Hammerhead KarooWahoo ELEMNT
Create/Follow custom workoutsYesYesYesPlannedYes
On-unit interval FeatureYesYesYesNoNo
Training Calendar FunctionalityNoYesYesNoSorta
FunctionsSIGMA ROX 12 SPORTGarmin Edge 1030Garmin Edge 820Hammerhead KarooWahoo ELEMNT
Auto Start/StopYesYesYesAuto-pause/restart (but not Auto-Start)Yes
Virtual Partner FeatureNoYesYesNoNo
Virtual Racer FeatureNoYesYesNoNo
Records PR's - Personal Records (diff than history)YesYesYesNoNo
Day to day watch abilityNoNoNoNoNo
Hunting/Fishing/Ocean DataNoNoNoN/AN/A
Tidal Tables (Tide Information)NoNoNoN/AN/A
Jumpmaster mode (Parachuting)NoNoNoN/AN/A
Weather Display (live data)NOyesYesNoNo
NavigateSIGMA ROX 12 SPORTGarmin Edge 1030Garmin Edge 820Hammerhead KarooWahoo ELEMNT
Follow GPS Track (Courses/Waypoints)YesYEsYesYesYes
Markers/Waypoint DirectionYesYesYesNoNo
Routable/Visual Maps (like car GPS)YesYesYesYesYes
Back to startYesYesYesNoYes
Impromptu Round Trip Route CreationNoYesYesNo (But can create one-way routes on device)NO (BUT CAN CREATE ONE-WAY ROUTES FROM PHONE APP)
Download courses/routes from phone to unitVia WiFi, not phoneYesYesNo (only via WiFi from site)Yes
SensorsSIGMA ROX 12 SPORTGarmin Edge 1030Garmin Edge 820Hammerhead KarooWahoo ELEMNT
Altimeter TypeBarometricBarometricBarometricBarometric (upcoming software update to enable)Barometric
Compass TypeMagneticGPSGPSMagneticMagnetic
Pulse Oximetry (aka Pulse Ox)No
Heart Rate Strap CompatibleYesYesYesYesYes
ANT+ Heart Rate Strap CapableYesYesYesYesYes
ANT+ Speed/Cadence CapableYesYesYEsYesYes
ANT+ Footpod CapableNoNoNoNoNo
ANT+ Power Meter CapableYesYesYesYesYes
ANT+ Weight Scale CapableNoNoYesNoNo
ANT+ Fitness Equipment (Gym)NoNoNoNoNo
ANT+ Lighting ControlNoYesYesNoNo
ANT+ Bike Radar IntegrationNoyesYesNoNo
ANT+ Trainer Control (FE-C)NoYesYesNoYes
ANT+ Remote ControlNoYesYesNoNo
ANT+ eBike CompatibilityYesYesYesNoNo
ANT+ Muscle Oxygen (i.e. Moxy/BSX)NoVia Connect IQWith appsPlanned FutureYes
ANT+ Gear Shifting (i.e. SRAM ETAP)YesYesYesPlanned FutureYes
Shimano Di2 ShiftingYesYesYesPlanned FutureYes
Bluetooth Smart HR Strap CapableComing soonYesNoYesYes
Bluetooth Smart Speed/Cadence CapableComing SoonYesNoYesYes
Bluetooth Smart Footpod CapableNoNoNoNoNo
Bluetooth Smart Power Meter CapableYes for ROTOR, Coming soon for othersYesNoYesYes
Temp Recording (internal sensor)YesYesYesPlanned FutureYes
Temp Recording (external sensor)NoNoNoNoNo
Compatible with Firstbeat HR toolsN/ANoNoNo-
SoftwareSIGMA ROX 12 SPORTGarmin Edge 1030Garmin Edge 820Hammerhead KarooWahoo ELEMNT
PC ApplicationWindows/MacGarmin ExpressGarmin Express (PC/Mac)NoN/A
Web ApplicationBarelyGarmin ConnectGarmin ConnectYesN/A
Phone AppiOS/AndroidiOS/Android/WindowsiOS/Android/Windows PHoneNoiOS/Android
Ability to Export SettingsNoNoNoNoNo
PurchaseSIGMA ROX 12 SPORTGarmin Edge 1030Garmin Edge 820Hammerhead KarooWahoo ELEMNT
Amazon LinkLinkLinkLinkN/ALink
Clever Training - Save a bunch with Clever Training VIP programLinkLinkLinkN/ALink
Clever Training - Save a bunch with Clever Training VIP programN/ALinkLinkN/ALink
DCRainmakerSIGMA ROX 12 SPORTGarmin Edge 1030Garmin Edge 820Hammerhead KarooWahoo ELEMNT
Review LinkLinkLinkLinkLinkLink

Again, don’t forget that you can mix and match against other bike computers within the product comparison tool here.



It probably goes without saying: I’m impressed.

When SIGMA first reached out last fall or so about the ROX 12, I was pretty straight with them.  I said I wasn’t interested in spending time on another boring bike computer that wasn’t remotely competitive with half the industry.  I explained I had more important things to do – like eating ice cream.  They replied not to worry, they had something unique.

And sure enough – they very much did.  While Wahoo has taken lead in recent years on challenging Garmin’s dominance, I’d say that Sigma has instantly dropped itself into the ring as well with the ROX 12.  It’s easily bested Wahoo when it comes to mapping and navigation, though it doesn’t beat the overall simplicity and cleanliness of the Wahoo BOLT for most basic operations.  Similarly, when it comes to challenging Garmin, the SIGMA does a superb job in the mapping realm as well as just being a solid and flexible bike computer, especially for touring folks.

Where SIGMA struggles a bit is around the overall integration story.  They have a capable (if slightly dated feeling) desktop app, that syncs via a cloud service that apparently floated in from the 1980’s.  No worries, Wahoo’s cloud service is equally as questionable.  However, the biggest gap for some will the be the lack of companion app for the ROX12, and with that, lack of smartphone notifications.  Like Hammerhead and their Karoo, SIGMA has no method of notifying you of incoming calls/texts/Tweets/etc from your phone.   That’s something that the company has some potential options on the table to fix, but none of them sound terribly near-term (or great).

Still, if that’s not important to you – then you should definitely consider the ROX 12 if you’re in the market for a higher-end mapping device.  It’s hard to say that it outright challenges the Edge 1030, because in a lot of ways it falls short there (such as around advanced training metrics, full app support, advanced sensors, and so on).  But where it does do a better/cleaner job is at lower end units like the Wahoo BOLT or Edge 520 Plus…just with a bigger and prettier screen.

The only challenge SIGMA will likely face here is that their USD pricing isn’t as competitive as their Euro pricing.  With USD being $475, that puts them trying to compete with Garmin’s higher end units, versus the 399EUR pricing is more competitive in that market. I think if SIGMA had priced the ROX 12 at $399USD (parity, as is common), they’d be selling units like there’s no tomorrow.  $475USD makes people pause when talking about a new entrant.

In any event – I’m sure there will be plenty of questions, so I’ll do my best in the comments section below.  Also, the unit starts shipping today. Initially, European distribution is fully sorted, though US/world distribution is being worked through and might take a few days/weeks until various global retail partners light up listings.  The company says they have plenty of units ready to ship, they just are looking for distribution partners to ship them to.

With that – thanks for reading!

Found this review useful? Or just want to save 10%? Here’s how:

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 exclusive benefits on all products purchased. You can read more about the benefits of this partnership here. You can pick up the Sigma ROX unit through Clever Training using the links below. By doing so, you not only support the site (and all the work I do here) – but you also get to enjoy the significant partnership benefits that are just for DC Rainmaker readers. And, if your order ends up more than $49, you get free US shipping as well.

Elite Direto Trainer

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.

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  1. (I think a typo in your 2nd paragraph, n’est ce pas? ‘completive’.. 🙂

  2. Bsquared

    Thanks Ray, at some point I want to upgrade from Edge 520 to a unit with fast/fluid turn-by-turn nav from Strava routes. A couple quick questions. For longer all-day rides, is it possible to charge while riding? Any company outside Garmin with plans to support bike radar?

  3. Tim Cruijssen

    Stroopwafel? 😀

  4. Phil S

    Hi Ray
    Could you give a very brief overview on how Strava Live Segment functionality compares to Garmin and Wahoo etc?
    E.g. Garmin 1030 allows comparison against more times for a segment than the rest of their range and Wahoo allows multiple live segments to be raced at the same time.
    I have an ELEMNT Bolt sat next to my Edge 520 purely for the more advanced Strava Live Segment functionality.

    • Tim

      Haha, I have two gps’s on my handlebars as well for that reason. I am also curious how the live segments compare. I also have a phone on my stem for the strava app. I might have a problem.

  5. Alan Taylor Farnes

    Great work. Thanks for this. I especially enjoy your section on GPS and Elevation Accuracy. I live in Utah and my Garmin Edge 500 ruins every HC climb so bad that I miss segments so I have to run my phone concurrently. Accurate GPS in the Alpine mountains is my #1 concern for my next purchase. I looked back at your Element Bolt review and you don’t seem to have a GPS and Elevation Accuracy section for the Element Bolt. Can you comment on the Bolt’s accuracy when in high mountains?

  6. Plumbs

    Blargh. Stick with the Wahoo. Cell integration is a must these days. I like to ride with my phone tucked away never to be seen unless I get an emergency text. No integration means the phone stays in my sight or pocket which is annoying. Having a life sux.

  7. Andrew

    I’m not going to buy without support fore either phone integration or garmin radar, but I’m hoping this pressures garmin to bump the internals of edges. The lag on my 820 is extremely annoying especially considering the cost

  8. Derek Chan

    No bluetooth to phone connectivity is very strange. The hardware is all there so rather than having to do a mobile hotspot every time to connect.

    • The hardware connectivity is unfortunately a wee bit trickier than one might think. Both Hammerhead and Sigma are actually in the same pickle here, and it’s really about how the Android stack broadcasts itself from a mac address pairing standpoint, whereby each time they go to pair they identify themselves as a new device. As a result, in certain scenarios a user could potentially have to re-pair their phone every…single…time.

      There are some ways they’ve looked at solving it, but none are great right now.

  9. Crash Bandicoot

    Kudos to Sigma, they figured out how to charge $475 for a really bulky phone with a nice cycling themed Android skin and no cellular connectivity.

    • But isn’t that true of any head unit out there, Garmin included (minus Android, but just an embedded OS)?

      Ultimately, the important piece here is the Sigma cycling app/platform atop it. Well, that and the fact that it’s waterproof and actually works with your fingers in the rain or with gloves. Or that it has ANT+ in it. Things most Android phones don’t do properly.

      But those aside, because the next comments will be that someone says they can do the same thing with a generic Android phone. My response is more simplistic: Cool story, bro.


      Because for years people have been saying it, but constantly miss the most important piece: The cycling platform atop it.

      Sure, there are many cycling apps – but none cohesively bring everything together like a Garmin, Wahoo, Sigma, or even Hammerhead. If they did actually do that, then years ago people would have switched to buying cheap Android phones off the shelf. Overwhelmingly, they haven’t.

      Which doesn’t mean things aren’t overpriced. As I said in the conclusion, I think the USD pricing of this is out of alignment by about $79USD.

    • Crash Bandicoot

      That’s fine and granted my comment was a bit sardonic, however, being very obvious that this is a phone you’d figure it would at least have the ability to have standalone cellular data a la the Hammerhead since most of the hardware is in place. Not knocking the idea of a phone underpinnings for a cycling GPS, obviously for race focused units like the Elemnt Bolt (in fact underneath a Phone is doing a lot of the routing work from my understanding) or the 520 there’s really limited need for that much processing power or that big of a display and for these products it actually makes perfect sense but jeez for the love of god don’t make your product look like a blackberry pearl or a Samsung I-730.

    • FJ

      “but constantly miss the most important piece: The cycling platform atop it”

      This is a very interesting comment. I’m a Garmin user, and I see what Garmin Connect is. Personally, the only reason I use it is to push my activities to Strava and other platforms. Other than that, only for the strictly necessary (like installing apps on my Fenix)

      I have tried to use my Galaxy phone as a cycle computer, and personally the reason I don’t use it is very simple. All the apps out there suck, big time. Like reeeeeally suck. Lacking a “platform” would mean little to me as long as I can push activities to Strava (and from there pretty much everywhere else, because lets face it, everything integrates with Strava)

      Would love to hear more on your opinion about this

    • Dan G

      “Sure, there are many cycling apps – but none cohesively bring everything together like a Garmin, Wahoo, Sigma, or even Hammerhead. If they did actually do that, then years ago people would have switched to buying cheap Android phones off the shelf. Overwhelmingly, they haven’t.”

      And I don’t think people are going to buy these enormous re-skinned Android units either.

  10. William De Ath

    What is the battery life like with GPS and sensors connected? The other issue is the lack of live tracking which has become important to me as I ride solo in remote Jura mountain roads and forest roads where I may pass a human now and again otherwise would rely on the cows and Lynx to see me if I am unable to use a phone. Having been knocked unconscious last year I am a little more safety paranoid about cycling alone in remote places as is my wife who gets comfort from live tracking which.

    • I haven’t see as much of an impact on battery life with respect to sensors, rather, it’s really screen backlight that gets you. If it’s on full blast, you’ll fly through battery life.

      I’ll try and get some more specific battery testing knocked out this week outdoors. I typically do more formal battery testing after a review publishes, merely because I don’t usually want to take a unit out of commission for that long to do the series of tests.

  11. Brian

    Wait, there is a chirp sound? Amazing!

  12. BartW

    Great review as usual.
    Nice product from Sigma this time.
    I have two questions:
    a) Are the maps based on open street maps? (unfortunately there are some Nordic counties where Garmin maps are still superior over the open street maps which are still missing huge amounts of gravel roads and paths)
    b) Does Sigma have any plans on adding ANT+ Trainer Control (FE-C) to this unit.

  13. cycloscott

    What’s the source of the maps? Road navigation is likely straightforward enough from about any source. But I spend as much of my time as possible off-road. Not having mtb and hiking trails would be a complete non-starter.

    Although being a non-starter is also an issue with that price and the lack of phone integration. My wife very much appreciates being able to track my live location on my 20 mile ride home from work. Which skirts along some highly trafficked streets and sketchy neighborhoods.

    • Source is OSM maps, same as Garmin uses on their Edge 520 Plus, Edge 1030 and Edge 820. I didn’t do much in the way off off-road with the Sigma unit, however, using that same base mapset on the Edge 520 Plus for offroad in California mountain biking, I was actually surprised at how good it was.

      I’m sure though regions/quality vary a lot, no matter the mapset provider.

    • cycloscott

      Agree that the OSM maps are pretty good fro trail use. I used to sideload those on my Garmin.

      Did they mention anything about adding phone integration?

    • There’s a lot of talk about how they might do phone integration, but the technical hurdles are the challenge. I outlined a bit more detail up above in a comment here: link to dcrainmaker.com


    Hi Ray ¡¡

    I appreciate a lot this full review of the brand new Sigma Rox 12.0. Right now I have a Wahoo Bolt but I want a device with colour maps and with more level of details… Maybe it’s silly, but I miss the data field with 10s of average power….

    And that’s my question…. Is it possible to zoom in on the profile of the route just like the older version of Garmins made ?? You know… the possibility to modify the x and y axis in order to see the elevation more or less pronounced

    • I don’t see a way to override the zoom level of the altitude profile. For example, at present the altitude profile graph is showing four graph lines ‘wide’, with each line representing 1,000y (imperial), so basically about 4/5ths of a mile ahead.

      In toying with the settings I don’t see any way to zoom out, though perhaps there’s some magic combo of settings that let’s me override it.

  15. Tom Bakken

    Are the Strava live segments based on average speed or waypoint to waypoint comparison ?

  16. Ian S

    No cell phone integration is a deal breaker sadly. That and the ‘90’s styling….

  17. Hillevi

    Fantastic. Been waiting for something like this. I’ve been hugely disappointed with Garmin Fenix 5X and Garmin’s inability to produce decent navigation features. I will most certainly get this one to use on my bikes. Kudos Sigma.

  18. Mike

    How does it handle re-routing when you go off course, it took Garmin forever to fix the 820, but that works great now, for example I never plan with cafe to stop off at, so sometimes I will take a small detour to a cafe, re routing back to where I left my route AND the ability not to re route but to figure out when you had rejoined the route.

    Smart phone integration is an issue, are they planning into integrate with the Garmin radar ?

    • It’s instant.

      The second you miss the turn it’s already got something else figured out for you to get back to the course and the direction of travel.

      It was actually interesting in that at one point on a river ride a few weeks ago the canal was small enough that it thought I had jumped to the other side, and then re-routed me a bit until it realized where I was. All of which wasn’t a big deal though because there was no actual points I could turn. Just cows and canals. So it figured itself out before I could have time to think about why it might or might not matter.

  19. mkpaa

    Is there a battery saving mode, similar to Edge 1030/820? Is there support for Edge remote?

    • No ANT+ remote support.

      Yeah, I noticed this evening on their marketing site (that just went live) they actually specify a 40hr low-battery mode. I can’t see any way of enabling such a mode, or how it works. It’s on my question list for the morning.

    • usr

      Another news source tells me that the screen can be powered down while recording (short press on the power button), it’s probably that.

      For me it would not matter much though, as the longest rides tend to be those with the most intense navigation use…

    • mkpaa

      Looks like battery saving mode is simply short press of power button. Not exactly what I hoped for. There doesn’t appear to be a way to set a timeout for battery saving mode and only way to wake it up is the power button.

  20. Bodoc

    Can the battery charging during operation? (OTG)

    • mkpaa

      If you can upload tracks while it is running, I would assume you can also charge it while it is running. Maybe someone should still confirm it?

    • Richard Stum

      You can charge it while navigating and recording an activity. Initially when you plug in and turn on an external USB battery you will get an error message that says you cannot upload tracks while recording an activity…simply press the round home button and continue navigating/recording your activity and the unit will charge.

  21. Owen

    The screen to bezel ratio isn’t very good. It reminds me of a Samsung or Sony feature-phone from 2006.

  22. mkpaa

    Does it have an option to just show multiple gpx tracks without navigating any of them? With different colors like Garmin Edges?

    (This should be obvious, but didn’t see mentions of it)

  23. Andrew

    I’m confused about whether the base (non bundle) includes the out-front Barfly mount as you state:

    a) Barfly out-front mount (with SIGMA branding), that’s in base and bundle kits


    b) Now, since the non-bundle doesn’t come with the out-front mount, you’ve also got the standard handlebar/stem mounts (two of them):

  24. Richard

    What is the SD card slot used for?

    • Just storage for maps. It’s got 8GB internally, but this allows you to expand it significantly.

      Realistically I don’t think most folks would use it, given how silly easy it is to load/offload maps. If you were talking the cumbersome process of maps on the Edge series, it’s nicer to set and forget. But with the ROX12, it’s so trivial that you can pretty much do it on-arrival in a country/region/etc….

      I suspect the SD card slot was there in whatever reference design they started with, and they probably didn’t see any good reason to get rid of it, since it gives them a bit of flexibility for storage expansion if they get onboard some cool apps and such.

    • Thierry

      I talked to the Benelux distributor this morning. The mSD card can also be used to store GPX-files (tracks). However, I’ve had no chance to test it yet …
      Could be a work-around for those who have a smartphone with internet-connection, but no computer of wi-fi network nearby : place the mSD card in your phone (if necessary via a cardreader, such as the GoPro Quick Key Mobile mSD card readers), load the created/downloaded GPX-file from your phone on the mSD card, and place the card in the GPS-device.

  25. mkpaa

    Does it support own maps? Either .img or some other standard format? So can you download your preferred map and use it?

  26. mkpaa

    Does it have option to lock screen (and buttons) when you put it to pocket during a stop?

    Is there way to upload a route manually, are routes and maps held in a potential hard reset? Can they routes and maps be uploaded from a microsd card? Does it support exfat file system microsd cards (Garmins don’t)?

    So many questions… 🙂

    • A) Screen Lock: I haven’t seen any method of doing it, but it’s a good question – I’ll ask. I did the jersey pocket thing on a few rides, and sometimes the touchscreen ended up in curious places as a result. 🙂

      B) Upload routes manually: You can use the desktop Sigma Data Center app to add routes, or, you can just drop a GPX/etc track into the ‘Tracks’ folder. It’s impressive how quick it is. No having to reboot the unit or anything. I just did it a second ago with a GPX file from Paris (while in Amsterdam), and then instantly unplugged the cable and was able to tap and open and see the unit (all within 5 seconds of drag/drop).

      C) ExFat: Let me dig up an MicroSD card I can flatten and circle back. Fwiw, supports size-wise up to 128GB.

      D) Bonus: I included a pic of the file structure.

  27. Larry

    Any info about support of Varia radar? Is that even a public ANT+ profile?

    • ANT+ Radar is actually a public profile, but Sigma hasn’t implemented it.

      I’m hoping that Sigma looks at the myriad of comments on Facebook, Twitter, and here and notes just how many people have been asking for this (more than people asking for telephone integration).

    • John

      ANT+ Radar support is now table-stakes for me. After riding country roads with it I refuse to be without it.

    • Matt Feldmann

      I want Varia compatibility too. I don’t need cell phone integration.

    • Goncalo

      +1 for Radar. Once you have it, it’s a must-have! 🙂 I can’t change for anything else without it, because 1. Varia Radar is really really useful and 2. I spent some money buying the radar, so it wouldn’t make sense to have a new bike computer that’s not compatible with it.

    • Mike

      +1 for Radar… will not buy without it, once you have had radar you don’t go back 🙂

    • bill30306

      count me in if it supported varia radar. the ONLY thing keeping from chucking the temperamental 1030 for a Wahoo Element is the radar


      Another +1 for the radar integration. I would gladly switch from Garmin but since no one else supports radar I’m not going anywhere.

  28. Ki Tat Chung

    I can’t help but be reminded of the old HTC Diamond Windows Mobile phone of yore.

  29. SimonN

    Think you should have been much more critical on the lacking of phone connectivity + ugly looks. I’m also missing information about actual battery life.

    • Yeah, I tried to outline the issues with the lack of phone integration in three different places. One thing I found semi-interesting in my Hammerhead Karoo review is that there’s actually a fair bit of people that don’t care about this (I do very much care, but surprisingly a number of people don’t care).

      As for battery life, I typically dive into that in more details post-review, once I can set units outside for more detailed testing for long periods of time in different scenarios.

    • Oh, and as for looks…shrug, some people like it, some don’t. Actually doesn’t bother me much at all. With the exception of the BOLT, I think most GPS bike computers look kinda ugly, so…yeah.

      (Also, the last time I noted how ugly the Lezyne units were, which I consider the most ugly of all, then people all said I was highly confused.)

    • Andy PB

      Wonder if you really mean you care personally or just that you would care personally if you were some of the people who don’t? Personally would not be an issue to me (unless I’m missing something). Don’t take my watch off when I cycle and it gives me all the general phone connected goodness I need – including strava beacon etc. No text is urgent enough not to wait till i have time to look at my wrist. What my watch does not do is give me convenient mapping and ride specific data fields without taking hands off bars. Wierdly therefore to me the big negative of this over garmin is no remote, which i guess just goes to prove what you say that even the most marginal feature is someone’s deal breaker.

    • I personally care about it – I absolutely want notifications on the unit as I cycle. I don’t always feel the vibrations on my wrist on bumpier roads.

      But yup, you’re point is spot-on on the remote. Everyone’s most important feature is another person’s “don’t care” feature. The good news is for things like the remote, it’s an ANT+ standard, so Sigma could add that in.

      Given they added in stuff like the eBike support, I’ve gotta believe remote would be a silly easy one. And I think if Sigma plays their cards right here and just goes wild with adding in all these standard ANT+ sensor types (lights, radar, remotes), then they can quickly pick-off Garmin loyalists.

    • Andy PB

      LOL – did not even occur to me about the missing notifications on your watch. Imagine how hard it would be to picture everyone’s use case. Oh – as you do so well!

    • mkpaa

      Heh. I personally never have notifications enabled or would I really want them. I find them distracting and irrelevant to me.
      This device made my choice really complicated. I almost bought a 1030, but really only thing I would miss is cableless charging. But 1030 doesn’t have a option for dynamo charging yet either. Combining exercises when using both rox 12.0 and 820 would be a little bit more complicated.

      There is a good chance that Android base will be better than Connect iq for new apps.

    • Mitch W

      Even though I love my Lezyne (it checks off all the boxes for what I need in a cycling GPS; maps would be cool, but turn by turn plus breadcrumb works fine, plus anytime I am using navigation in real life my phone is only a back pocket away just in case) you are correct. That thing is ugly. Especially, for me because I bought one of their “special edition” units on a sale, which is a terribly ugly color of blue instead of black. IMO great size though. Small enough to not be obtrusive; big and clear enough that I can glance down and get the info I want.

      I think the form factor plays into the decision for a lot of people. It was smart for Wahoo to market the bolt as being the most aerodynamic bike computer. I am sure that helped capture sales.

    • Daniel

      Many thanks, I really love this new unit. And I like the lack of everything I do not need for a better battery life, like smaller display and no phone connection. For staying connected I‘m wearing my Apple watch. Ok, it looks a little bit ugly, but same with Garmin in my personal view. Great review!

  30. The wider bezel has at least one advantage over the narrower ditto. I often adjust my computer while I ride, to accommodate sun glare. With the wider bezel I have something to grab onto without accidentally rerouting myself across Europe. Touch can be wonderful but in a bicycle computer it can be bloody annoying.

    The one thing I am missing in all computers to date (or don’t know about), is the ability to reprogram the physical buttons to the functions I prefer.

    Considering the extremely high build quality of my earlier Sigma computers, I am actually a bit excited about this one.

  31. Daniel Fleischer

    Epic review, chapeau!
    But hey, this thing looks it timetravelled from the early age of smartphones.
    Guess we germans are not the best in making tech look too well… what a pitty…

  32. Jaques

    Can you please load a map area of Tokyo or another Japanese city? With a screen-shot. This has been an issue when using non-western characters.

  33. Martin

    Thanks for the review! Coming from Germany, I can assure you that the strange names for data fields and intervals seem to be kind of a marketing issue, because the proper German words for these are nearly the same as in english 😉

    This head unit seems to be targeted at Garmin users. I’ll stick to the simplicity of my Wahoo ELMNT Bolt.

    Also, kudos for such a tasty name for a WiFi access point 😀

  34. Andre Lemos

    Does it consume any of the files that Best Bike Split produces?

  35. Meredith

    Will there be the ability to put custom maps on do you think? Also can you change the map colour scheme?

  36. Howie

    Having just gotten my hands on an Elemnt, the display setup via iPhone built the coffin for Garmin in my household. And save for the list of No’s in the Connectivity section of the product comparison, the nails are being hammered into the afore mentioned Garmin coffin.

    • Howie

      Is it only shipping direct from Sigma?
      It doesn’t seem to be available via clevertraining.co.uk (to support DCR).

    • Howie

      And although it might be “shipping” as 18.06.04, it’s not listed on the Sigma website. Hmm.

  37. DerLordBS

    can I use my Garmin Edge 520 mounts? Is there a mount for an triathlon bike around?

    • Yup, any Edge 520 mount works fine. In fact, I’ve been mostly using Cycliq and Garmin mounts for it.

      On the triathlon bike side, K-Edge makes a really nice metal one, as does Barfly too.

  38. Tom of Finland

    Does the DI2 integration support changing screens using DI2 buttons (e.g. the extra buttons on top of the shifters)? Fenix 5X supports DI2 but does not implement this so I’m curious.

    Is there a limitation on turn cues on courses like Garmin has (50 cues per route)? Not sure if this is just Fenix 5X issue or Garmin in general.

  39. Never buy Sigma. I had a wired computer unit from them. It was purchased at a reputable bike store. It was one year old. I emailed them, when I realized that the MPH calculations were not correct. You could find a 5% difference between their MPH calculation and using their recorded time and distance. I sent an email to them and they suggested that I should buy one of their superior new units.

    A friend bought a sigma wireless unit. She had endless problems. Did they support her? No.
    In the end that reputable bike shop gave her a brand new Garmin.

  40. David Merrill

    Thanks for the great review. One thing I don’t think I saw that I’m always interested in is the format of rides/activities on the device. This is important to me because having them in a standard format (like .fit) is meaningful to remove dependency on a proprietary vendor service to use information from the device. Being able to upload a .fit to any analysis site you want is a great option to have.

    • Records to standard .FIT files right on a USB mass storage device. 🙂

      I’m able to plug the unit in, and then it asks you to press the ‘enable’ button to go into mass storage mode (versus charge mode). At which point the files are accessible immediately in standard .FIT file. I’m able to successfully drag them into the DCR Analyzer as well.

      There’s a few minor internal quirks with their .FIT files, but nothing affecting the average user. They don’t currently record the ANT+ sensor ID’s internally like Garmin/Wahoo/Stages do, which really only matters for DCR Analyzer users, as well as sites like Today’s Plan that allow you to track that data. Hoping I can convince them to add it in, it’s an easy tweak.

  41. Kevin Frederick

    What is the screen resolution? Is it visible in direct sunlight (transreflective)? I wish both of those facts were in your comparison tables.

  42. Andrew

    I think I’ll stick to my Avocet 45tt, it is a bit more compact 🙂

  43. Timothy Doel

    Thank you for this incredible throrough review. I used to own MIO navigation and recently returned 2 MIO cyclo 400 because the GPS was horrible. It took 1,5 hour to get a GPS fix. I found the sigma Rox 12 and found it meets my purpose. Based on your review I purchased it today and should receive tomorrow evening.
    My main goal is navigation as I tend to cycle in places I am not familiar. SO a good GPS is most important. Since the navigation and mapping comes out excellent in your review, that gave me the last bit I needed to order it.

    Best regards,

  44. Looking to replace the Karoo

    No (ability to attach a) lanyard?

  45. Looking to replace the Karoo


    Also Ray, did you check if it can connect to a Wifi network which requires a login via browser like many hotels do?

    • iain callaghan

      hi there i connected it to my mobile via a hotspot including entering a password
      while i think the karoo screen is still beatiful this unit seems fantastic so far

  46. Robin

    Hey, Ray: should we expect to see any new GPS bike computers from Wahoo, Garmin, et al at Eurobike or later at Interbike? My Garmin 705 keeps dropping hints about retiring.

  47. Sjors

    Impressive review! thanks a lot.

    one question: is it possible to import gpx routes? i do ride several “toertochten” and would like to import their gpx routes before riding such a tour.

    thanks a lote

  48. Joerg

    I would like to point out one important aspect that might be overlooked with Sigma. To my knowledge it is the only company today that allows you to keep your data private. Meaning not forcing you to synch it to the cloud.

    I consider my health data private and don’t want to put it anyway near the cloud.
    If this is a concern for you, you should have a look at Sigma.

    What I do is using the Sigma Data Center desktop app to download my rides into my computer. From there I export into any of the 10 (common) formats, usually tcx or fit.
    I use Golden Cheetah for further analysis.

    So far I am happy with my Rox 11 (before Rox 10 which was lacking some power meter functions)
    Working rock solid without any glitches.

    Good to hear that Sigma has delivered something great with the Rox 12 too.

  49. David D

    The question that I keep asking myself is this:

    Are all of these guys just hanging on until the embedded technologies in smartphones render their individual components obsolete? I have the EDGE 1030 mainly because I am a geek, but the minute someone comes out with a case that embeds a forward looking camera (maybe just a periscope?) and ANT+ sensors with an extended battery weatherproofed and I am done with Garmin and so will alot of other people.

    Just my two cents…

    • Howie

      Agree 100%. All that room in the large bezels could be for embedding ANT+ sensors around an iPhone+.

    • Alex Masidlover

      What app would you use? I’ve often been tempted, but nothing I’ve found comes close to the number of metrics and flexibility of configuring them that a Garmin / Elemnt gives.

    • Funny tidbit: That case did exist, and nobody bought it. Back a few years ago Wahoo made exactly such a case for the iPhone, had ANT+ in it and even some variants had a barometric altimeter (wasn’t common on phones then), as well as an extended battery pack.

      Nobody bought it.

      But the problem was bigger than that – it’s just not business-wise viable because there are too many phone models with too fast a refresh cycle. With yearly releases and 3-5 models per manuf, the cost of goods is too high for an an advanced electronic case such as described without a massive market.

      And that all ignores the issue Alex mentions: Software.

      Folks have long predicted that phones would takeover head units, but the opposite has seemingly happened – high quality head units have gotten cheaper and there appears to be less interest in putting a handlebar on your phone when phones are getting more expensive.

  50. Laurens Bloem

    Bite the bullet already Ray… go metric!

    • Howie

      No kidding! Ray, you’ve been working & living in Europe for long enough now. And there’s only one country that’s not officially embracing metric, despite that most of the sciences have. It’s time to stop being backwards compatible with antiquated thinking.

    • Frank

      Couldn’t agree more.

    • Paul S.

      If you guys want to give into French imperialism, that’s your choice. (We got them off mainland North America during that time, for a small payment.) You do realize that it’s just a scale, right? That a km is just a mile for wimps?

      As for what’s used in science, that all depends on the science. And which metric do you mean, mks or cgs (it makes a difference in electromagnetism)? Generally you use units that allow you not to write all of the annoying constants all of the time. In high energy physics, \hbar (Planck’s constant divided by 2 pi) = c (speed of light) = 1 and everything (masses and energies) are measured in eV (electron volts), generally MeV. No one would give the mass of a electron in grams, it’s 0.511 MeV. In relativity, G (Newton’s gravitational constant) = c = 1 and the mass of the sun is about 1.5 km. In astronomy in general, you usually measure masses in solar masses, not gm or kg (easy enough to convert if you actually need to, which you probably won’t). In my current field, planetary science, you generally use metric (no one uses statute), but it might be more convenient to measure a distance in units of the target’s bodies radius, in my case R_S (the “radius” of Saturn, which since it’s oblate and gaseous is defined as the equatorial radius of the 1 bar surface) or R_T (radius of Titan; since it’s solid and nearly spherical you don’t need all of the caveats). So in general you use convenient units, but you have to be very clear about what you’re using. It’s easy enough to switch back and forth between statute in everyday life and metric or something else in other cases.

    • As Paul says, it’s not quite as black and white as people claim to be. In the UK for example, speed limits are displayed in MPH, not KPH. In aviation, every country in the world uses statute.

      I mix and match depending on what I feel like. I can go either way, so it doesn’t matter a ton to me.

    • Rosso

      It’s not statute miles in aviation, it’s nautical miles …

    • Aviation uses feet, not meters. Also, MTOW which corresponds with ATC metrics like weight designations (i.e. ‘heavy’), are also driven in pounds.

      It doesn’t really matter to me. I’ve just never got why folks are so obsessed with making folks change to one variant or the other. If someone comes to the US, I wouldn’t care if they used kilometers on their watch. It doesn’t make one any faster or slower.

  51. Juro

    Before the GPS (Garmin) era I was exclusively using Sigma (Sigma Sport) computers and heart rate monitors for a very long time. They used to be the leaders… good to see them being competitive again after a period of relative irrelevance.

  52. Liechty Bill

    I’m a long time user of the ROX 6.0 and have about 6 years of riding stored in the Sigma Data Center. Lately I’ve been doing a lot of touring and route planning. Nearly all of my rides (actually ridden) or planned routes (either planned by myself or someone else) have been saved using the Ride With GPS (RWGPS) application on my iPhone. RWGPS can export routes in several formats such as TCX Course, TCX History, GPX Track (.gpx). I’d really like to have turn by turn navigation and quality maps for some of routes I’ve either ridden or planned out.

    Is it possible to import my RWGPS data directly into the ROX 12? Or would I somehow have to get the data into Strava first? If the RWGPS import feature isn’t available now do you think it is likely to be available soon?

    btw: I’m a complete novice as far as GPS stuff is concerned.

  53. Steve Hammatt

    Karoo has been $399 for a while now, not $299/$300.

  54. Don

    Does the device speak the navigation alerts? Or is it just a beep to let you know about a turn?

    • Timothy

      150 meter before a turn you hear a beep and auto zooms (if turned on and not zoomed in). It shows you a very clear red arrow how you need to go. Also a small text sign saying ‘turn right 40 meter’ etc. At the turn itself you hear another beep.
      When you are on a page without the map, the bottom part of the screen will have a red banner with instructions where to turn which direction. Very clear as well. Can’t miss it.
      You can clearly hear the beep when going against the wind.

  55. Rosso

    The device is too large for the display size, but there is enough space in front of my handlebars. I suppose there is a rather powerful CPU so that they need a larger battery to achieve the specified endurance.

  56. Igor Drobiazko

    Ray, thank you for a great post which convinced me to buy ROX 12. I had my first ride yesterday and I experienced a lot of the ghost turn notification you were writing about. They are coming way too often and make the navigation an awful experience. When the map is showing you need to go right a notification tells you to turn left and vice versa (see the attached picture). Even if the current street is straight forward for a couple of kilometres, the turn notifications are popping up and tell you there is a turn. This is very annoying and I don’t understand how Sigma decided to bring a device on the market with such a significant bug. Currently starring at the map is the only we to use this device for navigation. Do you know their plans about fixing it?

    • i know they’re working on it. From what they’ve said (and I noted above), the issue is challenging because it’s figuring out the nuances of underlying data sets and which turns are true or not. In the vast majority of cases, the road/trail is actually changing names/identifiers behind the scenes, which is what triggers it. So it’s a matter of figuring how to show that kinda stuff without missing actual turns.

  57. Nathan

    I’m seriously considering buying this unit. Here are my thoughts on what I’m looking for in a GPS:
    – Navigation and mapping is important.
    – Tracking routes and workout information is important, but my Forerunner watch is there for a backup.
    – Notifications don’t matter (riding is my escape, and I guess I could always have the watch alert me).
    – Radar integration would be nice, but I’m honestly not sure how I would change my riding knowing that a car is behind me.

    Is this the best unit out there for these factors? Some of the comments on blogs about the Garmin Edge units make me worry about their navigation and re-routing (Specifically the 520 Plus, but it sounds like the 820 and 1030 share some of the same issues). Is there something else I should be looking at?

  58. Andrej Schmitt

    Hi Ray, maybe you have a recommendation. After your good review I got a ROX 12 yesterday and took it on a 160k ride today. Navigation was ok, but to often I missed a turn because nothing was announced. Also the ghost notifications you wrote about.

    But my biggest struggle with the unit is: i connected a vector 2 to it. It perfectly showed TSS, NP, etc. but it did not sync any PM data to training peaks. Hooked to my MacBook and tried Sigma Software. Also, no Pm data. My forerunner 5 recorded the data perfectly..

    Any ideas?

  59. SJors

    I bought the rox12.0 last week, based on this great review as Well.

    I was very exiceted based on the first impressions. Yesterday i went for the first ride. Unfortunatelly the sigma crashed and stated “could not Find the sigma app”. Tried several times to ervoor or restart, But the computer could not start up again…

    Very disapointed a Did my ride without the sigma rox and i have to send it back to the online seller. Anyone facing the same issue?

    • Weird, never had a crash on any of my units.

      To reset the unit however, you can (steps I received at one point):


      You can recover the device like this:

      1. Turn off the device (push and hold the power button for at least 10sec)
      2. Push and hold the Power+Home Button (center top) for about 10sec
      3. It will start automatically the Recover Mode
      4. Push the Home Button again
      5. Select reboot option

      Now the system should boot normally.

    • Csaba

      Hi SJors and Ray,

      I have quite the same experience.

      I bought the unit based on Ray’s review and used it first yesterday on my mountain bike ride.

      Since I have the unit (it’s two days…) I had four unexpected reboots and once I also got into the “could not find the sigma app” situation that I could fix by pushing the power button approx 40secs triggering a factory reset.
      Two out of the total four reboots ended up being a total fresh setup starting with the “choose Your language” screen.

      Ghost turns – I have them too and using the unit off-road (what I do most of the time) yesterday during my 60kms it made me turning off the navigation overlay function after the first hour.

      I used to use my edge 1000 for navigation purposes that has it’s own faults with navigation however at least it has an option under the tracks to have them “always on” so I can see where to go without the ghost notifications – the ROX does not have this option either (I just write this down to mention that there are viable workaround solutions – at least there are for my needs)

      I like that You can change the screens with the buttons when the device is locked (if You push the power button there is the option to lock the screen) and overall I like the look and feel of the device and the layouts, and have been waiting so long to change my edge 1000 so that’s why I bought this one.

      …and it seems that it goes with the same 10% power consumption / hour as my edge 1000 did (map displayed with some extra data shown)

      I really want to go with this unit on the long run so I will contact the customer service tomorrow and see if they have a planned firmware update coming within the 14days I have before sending this back (400EUR…)

      Have a nice day,

    • Timo

      Based on the review and some more investigation into Sigma I bought it as well. Am very satisfied. I haven’t had the unexpected reboots and only a few ghost turns. I did find a few bugs which I reported to Sigma. I was well impressed with the speed of their response. Within 30 minutes I had an answer and direct email. So mailed them the bugs I found and was told later that day a new firmware is in the making. Touch will be optimized, entering credentials (related to the touch) will be improved (multiple characters with 1 click). Downloads of maps will be looked in to. Had problems downloading the maps of Malaysia. Also a problem I had was to get the Rox 12 on my preferred network. The current limitation for the WPA key is 25 characters. They are looking into it if that can be higher. Not sure if that’s going to be solved in the first upcoming firmware though. Logging on to Gpsies doesn’t work as expected. Only a username has to be entered. No password is asked.
      I have routes which I can start from Route, but can’t start from Navigation – Route. Just keeps loading and loading. Directly through routes I can start within 5 seconds. Still need to test out if that’s a problem with the GPX file or the deivce. So far I had this wth tracks which were recorded with Runkeeper and tracks downloaded from gpsies.
      I’m sure they are working on a few more bugs.
      They don’t want to come out with an update every day so they are bundling it.

      Hope this helps.

    • mkpaa

      The gpsies bug is ridiculous. Didn’t anyone test it before release?
      I also haven’t been able to log in to Sigma cloud.
      Separate keyboards for separate apps is also a bit annoying, but that is issue with most Android devices anyways. 🙂

    • Timo

      This should be solved in the upcoming firmware update.

  60. Paulo Fontes

    Hey Ray, after reading your review I went ahead and bought one. Two issues I’m seeing, let me know if you experienced anything similar:

    1) Strava does not sync all of my Segments, when I click Sync Data it just spins and then shows “Sigma APP has been stopped”. When I go to the segments list it only shows 4 out of at least 20 that I have…Needless to say this has prevented me from testing the Live Segment feature.

    2) When I finish a ride the upload to Strava works perfectly, but the one to Training Peaks gets messed up and does not upload the Power data from my P1 Pedals. When I go to the Sigma Data Center and sync it to TP through there it works well.

    Any help would be appreciated.

    • Juniorm

      I bought one too on the back of this review!

      I noticed that a maximum of 30 of my starred segments are copied to the device.
      This seems to be a limit that they put on it, which is pretty poor and renders Strava Live segments useless.

      So, I have to manually enable/disable most of my starred segments depending on the route I’m taking.
      I’ve complained to Sigma and Strava about this, as I’m not sure who imposed this:

      link to support.strava.com

      If they don’t fix this, I may send this back and go for the Garmin 1030.

    • Shane

      Hay how is the Strava live segments working with the newest update? Can you get more then 30 segments? Is the info good while on a live segments?

  61. Ted


    I got one to, but Iám very disapointed.
    Can´t conect to cloud.
    Did a few resets, and at start it says cloud conected.
    but in use there is no more conecting possible.
    Seems support here in Germany didn´t work great. No help yet.
    Sorry for my english

    • It’s a Germany company, thus, it’s odd you haven’t had success with support. When did you first contact them?

    • Ted

      Email to support 09.06.18, answer 11.09.18. They told me that they work at the cloud server and maybe thats the reason. But it wasn´t.
      Today I called the support, but no direct help.
      They told me they will call back, but maybe not today.

    • Ted

      Called me back today, to tell me they will call me tomorow to fix it.
      still waiting, no use for me at this time.

  62. Andrej Schmitt

    Hi all,

    until now i am quit disappointed with the device and thinking of returning it.

    – Navigation is very buggy. I got turns where no turns are and on the other side where really a turn has been i got nothing. So some times i had to ride 1-2km back to be back on route.
    – Powermeter Data from my Vector 2 is not recorded. Only NP, TSS, etc. is saved. My Favero however is working
    – Before my morning ride today i needed to restart the unit a couple of times to connect to my Favero PM. Got it working somehow
    – In the middle of the workout the unit crashed (something with Sigma App was written). So needed a restart. Parts of the workout where thus not recorded

    For 400€ here in Germany i expect at least a reliable device. I don’t need a crash in the middle of an ironman race. Never had a crash with my edge 820. So guess i will go back to that one. Navigation, Display size, overall layout of the ROX are very pleasant, but it lacks reliability.

    • Limberg

      Unfortunately, as always waiting for new devices announced until a stable firmware exists. But I think that Sigma generally makes it very fast and then the devices and the software (Sigma link and data center) are very stable. I currently have the Rox 11 (previously the Edge 520) and have no problems with the device and the software!

  63. Iain callaghan

    Hi Ray in your review it states its not designed for running but there is a sport profile on the device specifically for running it would seem, so am in correct in saying it can be used for running or have I missed something?

  64. mkpaa

    Was there option to simply display multiple routes without navigation? (2nd time asking) 🙂

    • Csaba

      If You are searching for something like that the garmin devices have (always on option under the tracks and then You can colour them differently one-by-one) the ROX 12 does not have it in this firmware version.

    • mkpaa

      Damn. That was exactly what I was looking for. Does it have it for single route? Eg. not giving any turn-by-turn instructions?

  65. Madtraveller

    Mmmm very mixed feelings. Just bought the Rox. I had a ELEMNT before. Very reliable but I was missing slightly better navigation options. Setup took a while – had to reboot 2x times before it recognised my Di2. But so far no luck on linking the Polar sensors. Created a route with Kamoot. Loading went fine, but then … lefts are rights, bends in the road get a beep and arrow, but when I need to turn (a real turn I mean) – nothing. Also had 1 reroute (missed a turn) and it kept sending me in a loop. The lines/colors or route done, recalculated route and orginal route get very messy. Halfway I thought maybe it was the Kamoot route. So switched to the internal route calculation. Calculation went very fast but it didn’t take into account specific bike routes along the canal. So got bored and switched the routing off. The draw route looks cool but to draw a route of say 60km you need to zoom out pretty far and then it’s really pot-luck. The resolution of the screen lets you down. For the price I was expecting a bit more.

  66. Bernd

    Bought the unit last week, and did two testrides, here are the (dissapointing) results;

    – the unit keeps crashing during a ride. 4 times on a 90km ride! Message “sigma APP stopped working.
    – i wanted to check if the unit had the latest firmware, but Cannt find anything on their website
    – the unit restarts itself after the crashes
    – when can we expect an upgrade fixing the crashes? No info on website.

    I really like the options to go to the nearest point of a route, and also the recalculation workshop excellent.

    But if nu update soon i will return the unit…

    • Bernd

      Update: according the Dutch helpdesk there will be an update which will correct the crashes by next week.
      There is an issue with the sensors, which causes the crashes.

      That is actually pretty responsive, their helpdesk. CUDOS for that.

    • DCR

      Interesting – did they specify what specific type of sensors triggers the crash?

      Fwiw, I mostly paired power meters and HR sensors.

    • Bernd

      No, he said to disconnect all sensors for now.

    • Lonelobo

      i had the same problem with the crashing app, and mailed sigma service about it. They responded with saiying that it has to do with the ant+ implementation of the sensors, and a fix is in the workd (i have the sport version with cadence and heartbeat sensor)

    • Paulo Fontes

      Yeah, they told me the same thing about my crash when updating Strava, I removed all sensors, even did a factory reset and I can’t still get the Strava sync to happen fully, so no segments are synced. I am now getting worried that the FW update won’t fix my issue…I have no crashes during my rides though.

      I also use Power Meter (P1 Pedals) and HR (Wahoo Tickr X).

  67. Rich Zvosec

    I’ve been using the ROX 10 for three years and it consistently undercalculates trip distance by 2-4% when using an ANT+ wheel rotation sensor. This is comparing the calculation to other apps and devices when the tire circumference is identical in each device. Did you do any ROX 12 comparison of the distance accuracy when using a speed (wheel rotation) sensor?

    Note the GPS distance calculation is comparable to what get with other devices and phone apps.

    • Timo

      I bought the Sigma Sport R2 duo combo ant+ and connected that to my Rox 12.0.
      There are no problems with crashes. The speed and distance are accurate compared to other devices not using the sensors. Tested this on short and long rides.

  68. mkpaa

    HNNNNNNGH. Tell me I can turn routing off somehow? It says that routing maximum distance is 300 km. I don’t want to start splitting my tracks for this. 😛

  69. MB

    Agreed on the pricing. I’d probably pay $300-$350 for this device as reviewed. If the phone integration was better, I’d probably bump myself to $400. Over $400 US as is, tough to justify IMO. Interesting device, though, and if pricing comes down 20% in the future, I’ll reconsider.

  70. Rutger

    Dear Ray and readers,

    Love the website, have been reading posts since it exists and will continue to do so.

    However, regarding the Rox 12.0 please do note the following before you purchase the device.

    I own the Rox since Tuesday 26 June. To my disappointment, it did not connect to my Polar bluetooth heart rate and cadance sensors. The only bluetooth sensor currently supported is that of the Rotor powermeter. This has been confirmed to me by Sigma Sport, who were also kind enough to provide me with the cadance sensor I needed (I already own multiple ant+ heart rate sensors, so this was a lesser issue).
    It was initially a major disappointment, because I bought the Rox based partly based on the consideration that BLE sensors were supposedly supported. There were some firmware issues also, which were also resolved completely to my satisfaction by Sigma Sport.

    The superb follow-up turned the rather negative experience (I was close to trading the device in for a Garmin 1030) to a very positive one.
    But please be aware of the lack of BLE compatibility when you consider buying this device.

    Regards, Rutger

  71. Dennis

    Hello mike I understand that for a combination with a power meter is perhaps better to prefer the 1030 garmin edge because it has the firstbeat metrics? (although not sure of their reliability)

    Can sigma software provide an estimate of ftp like pc8 srm and garmin?

    Compared to the elment bolt unit, it is more precise in determining the altitude and in managing slope and cadence (I noticed that wahoo elemnt bolt has some problem of precision in this respect).


    • Axel


      i bought a ROX 12, inserted a mico-SD Card, but I can’t see the card with my Windows file manager, while connected with USB. The internal memory of the ROX remains the same, free space is 2 GB. Card is okay and works, checked the issue with another card in the ROX. Doesn’t work too. Who has the same issue?Got a new firmware last week. Release 35016.

      Best regards

    • AndyC

      Same problem here. FW upgrade to rev.35016 did not fix it.

    • Lonelobo

      Where and how did u upgrade to FW rev.35016? i’m still on rev 34171 and cant seem to update to a newer one.?

  72. Andie

    Hi! I am curious to know why you didn’t compare the Polar V650 to this unit? The non-mapping offerings were included, so why not the mapping one? Thanks!

    • I didn’t compare it within the comparison tables or text anywhere. I had some photo comparison shots, but that was largely just a collection of units I had handy with me for other things. They were also the most popular units out there.

      The V650 doesn’t do legit routing, which is why I focused on the other units when talking comparisons in the rest of the post.

    • Jacques

      What specifications or features do you consider to be “legit routing”?

    • Ability to actually know the streets your on and re-route on the fly when required. Versus just having a breadcrumb trail overlaid onto maps that may or may not have street names.

  73. Rutger Broekhuizen

    Hi Ray,

    Maybe my previous post was unclear or too long, but I do want to help other people by preventing from running into the same disappointment as I had.

    So here it is again: The comparison table wrongly states that bluetooth only sensors are supported.

    E.g. Polar HR straps and speed & cadans sensors do not work with the Rox.

    This has been confirmed to me by Sigma.

    Regards, Rutger

    • Sorry, I thought I had fixed it upon your first comment. Confirmed as fixed now in tables. Sigma says it’s coming shortly.

    • Juniorm

      Also Wahoo BlueSC Speed/Cadence sensors do not work with it.

      It seems that if you have a 3rd party speed & cadence sensor, it stops a few things working, such as the Gradient, and Speed from being shown on the device and interferes with a few other calculations.

      This is probably true for all 3rd party Speed&Cadence sensors at this time.
      I’m pretty sure this can easily be fixed in an update though.

      The only other niggly issue is that it only stores 30 Strava Live Segments at once on the device. (I’ve complained to them about that too!)

  74. Deen


    Ive got a question about the data Rox 12 can display during rides. Lets say i’m cycling in the mountains. The trips consist of multiple mountains of different lengths and steepness. Can the ROX 12 display information about these mountains individually in one ride?

    For example, I want to see when the first mountain begins, how much km it is to the top and how steep it is. When the second mountain begins I also want to see where it starts, how much km it is to the top and the steepness. Basically, I want to see the complete profile of the ride but also with individual information about the mountains. Is this possible with the ROX 12?

  75. Simon

    Bought a Rox 12, hardware and software looked quite promising. However, the devices software turned out to be that half-baked that the device never actually made it on my handlebar. Played around a little, loaded some courses and did a firmware upgrade. Suddenly the Rox 12 was always showing the error “sigma app is not responding”. Tried rebooting, factory resetting, calling the Sigma support. None of that helped and I had to return in the end. Seems I am not the only one with that problem, so “the most complete cycling computer to challenge Garmin’s higher end mapping devices yet” is not good enough yet, unluckily.

    • Nitin Sawhney

      I purchased a Rox 12 recently and it’s worked fine for over a month, however the latest firmware update also bricked my device similarly. I got in touch with tech support over email (both the Dutch and German folks were super responsive). This is what they suggested, which worked perfectly fine:

      The customer should try following to restart the device. If the customer has a boot loop they must send the device to us, so that we can flash the device with the correct firmware. Our guess is that the ROX 12.0 SPORT had a problem before the customer has done the firmware update.

      1. Hold the “On/Off Button” and the “Home Button” simultaneously for 20 secs to open the “Recovery Mode”.
      2. Press the “Home-Button” to enter the menu and select the field “wipe data/factory reset” with the buttons on the side, then press the power button to select it.
      3. Select now “Yes–delete all user data” with the power button and wait till the process is done.
      4. Press “reboot system now” to restart the device.
      5. Once restarted, you can use the menu prompts to setup your device with your settings.

      That’s it – hopefully the next firmware update will be more reliable, but this should get your device working.

    • Simon

      Didn’t work for me, unluckily. Since the customer support refused to send me the firmware file so I could try the “flash from sd card” option of the recovery mode I had to buy a Garmin. Good luck to Sigma, maybe I’ll try one of their GPS devices again in 5 years 😉

    • You are not the only one with that problem. I had the same problem here in the US (device says “Installed Firmware 35016” and is current, whatever that means). I am currently on ROX 12 number two which they sent me quickly (sometimes I just feel jinxed…I went through four iPhone 6s in one year…under warranty). My second ROX 12 also had the same error message. I found that when that happens I pressed “wait” rather than restart or reboot…

  76. Igor Drobiazko

    Sigma’s customer service (at least here in Germany) is awful. You send tickets and never get any meaningful response. The support person only tells you that your request will be forwarded to developers and you never get any feedback or status again. The tickets stay opened forever. They don’t even ask you for details about the problem you reported.

    • Rutger

      Not to defend them, but just to share my experience:
      In the Netherlands my experiences have been great. At first use, the unit crashed. I wrote a complaint to the Dutch customer services address. They wrote back within the hour and offered to come by to install a firmware update which had not been officially released. I went by their offices the next day and they installed the firmware update. No crashes after that. Because I was misguided in thinking that the unit supported bluetooth only sensors, I was pretty pissed of when I found out I could not pair my Polar sensors. They provided me with a free cadans sensor and offered me a free heart rate sensor (which I declined, because I have ANT+ sensors too). Also received a free colour cover.
      I can offer no explanation why the service in Germany sucks, but my experience in the Netherlands has been exceptionally positive !

    • Igor Drobiazko

      Then probably I should send all my tickets to the dutch email address. Where do you send them to?

    • Nitin Sawhney

      Dutch Service folks are most responsive – email: Kundenservice 

    • Nitin Sawhney

      You can find the Dutch service email here: link to sigmasport.com

    • Hi Igor,
      Sorry to hear that you are not satisfied with our service.

      I would like to give you some explanations about the turning guidance.

      There is a difference by using an existing course or a one point navigation. If you choose the one point navigation, the ROX 12 will check all existing turns and they are reliable.
      If you use an existing course it is different. It won’t follow our routing algorithm. So we have to re-calculate all turns, which is quite tricky. And like you already experienced, it ends up in misleading information’s. Further there some external factors to consider, e. g. a course with bad GPS accuracy.

      To make a long story short.
      We will improve the course navigation, but we don’t want to make a fast shot. We take all feedback thru any channel serious and will work on that!

      You will receive further information to the open tickets within the next days.

      Sorry for causing any inconvenience.


    • Juniorm

      Hi Daniel,

      I noticed that only a maximum of 30 of my Strava starred segments are copied to the device.
      This seems to be a hard limit, which is pretty poor and renders Strava Live segments useless.

      So, I have to manually enable/disable most of my starred segments depending on the route I’m taking.

      Why can you not remove this limitation for this new unit? It makes Live Segments a waste of time otherwise

      You mention this with an older unit here:
      link to support.strava.com


    • Hi,

      The Strava Live Segment support will be updated soon. In the next update the supported segments are 100.

      Sorry for causing any inconvenience.


  77. Hoping to get an answer, in use combined with a power meter which one should I prefer? Garmin edge 1030 or Sigma Rox 12? and why?

  78. Matt Rick

    I never use turn by turn instructions, find them really annoying. I currently use a Garmin 800 and just display the route on map, and keep an eye on the screen near junctions. Can this be done on the Rox 12?

    • Hi Matt,

      Sure this is one of the basic function of the ROX 12.

    • Daniel

      Hi Daniel,

      I just asked the german support this question (if it´s possible to only have the track on the map *including the current position* but *without* routing) and their answer was „No, that is not possible“.

      Maybe you can provide some more inside, like screenshots?

      Many thanks for clarification!

      Cheers from Germany,
      Daniel 🙂

    • Hi Daniel 🙂

      That’s true. Actually there is always navigation ongoing. But I guess this is not the main issue you facing to (please correct me if I’m wrong). It is about the clear message, to know when you are off the track/course and when you are on. The navigation will help you, to find a way back to the track/course. You don’t have to stop and discover by your own.
      We are aware of that and working on a more clear solution, which will be available in the next update. 🙂
      Update will be ready latest early autumn.

    • Daniel


      Did I get you right: With the software update you mentioned, it will be possible to only view a manual prepared and uploaded track (e.g. automatically synched from strava) on the map without routing? And you will see the current position and the map will automatically center“ on the current position? And you can zoom in and out manually?

      Many thanks!


    • Hi Daniel,

      Sorry for my late reply. I missed your comment.

      We have reviewed a lot of feedback regarding the track – navigation and re-routing issue. For the next update, we improved the turning guidence significant. This took a lot of time to make it close to perfect (perfect is not possible to reach 😀 ). So the feature to simply just display the track, like you mentioned, will not part of the next update. Acutally and can’t give you a promise when this feature will be available. But we had it on our road map.

      If you have any further question, just contact our customer service.


  79. Daniel

    Hi and thx for your update! I see your point and this of course is a valuable function. But most cyclists I know would like to have the option, means both. Including me 🙂

    Did I get you right: With the software update you mentioned, it will be possible to only view a manual prepared and uploaded track (e.g. automatically synched from strava) on the map without routing? And you will see the current position and the map will automatically center“ on the current position? And you can zoom in and out manually?

    Many thanks abd cheers.

  80. Matt Rick

    Just read a review on another website which states it doesn’t support routes/tracks over 300km so no good for randonneur’s, anyone know if this has been resolved? Also until a software update implements the view route/track onscreen without routing prompts i’ll have to hold fire purchasing one of these.

    • I asked Sigma about this, here’s what they noted:

      “If the device has to do the routing by itself, the max. length is 300km. If you already planned a route (.gpx file) you can put it to the device an use it (e. g. 700km).”

  81. Petri T

    Had my first ride today with the device. After 72km the device shut down unexpectedly. Had to reboot to see there was still 45% battery left. Not very good first impression. It did save the activity though, but there’s no way to continue old activity so it became a bit problematic to follow the last kilometers of the planned activity back home. This is by far the worst bug I have encountered so far but there are too many to my liking.

    • Petri T

      I used broadcasted HR from Garmin Forerunner 935 and Garmin Speed sensor. Could not even connect to cadence sensor. Too bad if the cause of crashes are the sensors, because without them it is just a navigation device. So better keep a backup device recording all activities for now.

    • Hi Petri,
      sorry for reply that late to your post.

      Please make sure you have installed the latest Version (actually it is 35016). With that version you shouldn’t have any problems with the ANT+ sensors. If you still have any issues, just contact our customer service. We will figure out, what is the issue.


  82. Rutger Broekhuizen

    Dear Ray,

    I have been a big fan of your website since the very beginning. This makes it very disappointing to find that this review still states that the Rox 12.0 supports bluetooth heart rate, speed and cadence sensors.
    It is simply not true and this has serious consequences: People, like myself, are buying this very expensive piece of hardware on the basis of the information in your review. I am sorry to say that I am very disappointed in your response to this issue and my trust in your site took a very big hit. Staggering really, for such a highly regarded reviewer and influential writer.
    It begs the question: Why are you not adjusting the text of the review to reflect the actual situation?
    You have updated the product comparison chart, but the review itself still incorrectly states bluetooth sensor support. I am very doubtful that I would have bought the Rox 12.0 if your review would not have been so overly positive and would have stated the correct information. I also doubt that I am the only one.
    Kind regards, Rutger

    • Sorry, I didn’t catch that it was also in the text when I updated the table (mostly because I usually only list compatible sensors in the text).

      It’s updated now.

      Out of curiosity – what speed/cadence sensors are you using that aren’t dual ANT+/BLE?

    • Rutger Broekhuizen

      Polar Cadence, Speed & heart rate sensors, used these with Polar M450. Polar heart rate strap very useful because of Gym link also, and very comfortable strap.
      The 1030 was 130 euro more than the Rox 12.0. If I had known the extra costs for buying new sensors and the software issues which I have to deal with in advance, I’d probably bought the 1030. The initial positive experience with customer support from Sigma won me over however to keep the Rox 12.0.
      The software issues (usability interface and bugs) are however not over, so I am having a love/hate affair with the unit on pretty much every ride.

    • Hi Rutger,

      Fully understand your issue. That’s why we offer sensors with dual mode communication (ANT+/BLE) to cover the gym use case as well as the cycling.

      We know, that we had some issues in the very early stage (which are solved already). We are working on the next release which will be available soon. There are further improvements and some new features. Looking forward for the next release.


  83. Richard Stum

    I have been using the 12 for several weeks now. I am gravely disappointed that they removed the mobile phone notification that was on the much less expensive ROX 11, which I had been using for the past two years!

    Does anyone know if a point of interest (POI) will show on routes which I have uploaded into the ROX 12? I typically create all my routes in RWGPS and then export them as GPX into the Sigma Data Center which is on iMac. No POI data seems to come across. I even manually added several POI to a route in the Sigma Data Center mapping program and then pushed it to the ROX…but still no POI was visible on the ROX 12 screen. The reason I want it is that I do Audax or randonneuring style of road cycling and need to know where my control or checkpoints are.

  84. Yiannos

    Hi fellow cylists,

    I like this thorough review as I want to purchase my first GPS-unit.
    I have compared many devices on the internet and all of them have battery issues. There is a world to win in manufacturing longer lasting batteries 🙂

    I want a GPS for riding existing rides like Liege-Bastogne-Liege, so with full navigation. How will the battery of this Sigma Rox hold?

    At this moment I want to choose between the Wahoo Elemnt, Garmin Edge 1000 Explore or the Sigma.
    I like intuitive devices!

    Please help!


    • Axel

      Hi Yiannos,

      battery drain depends of display light on/off, navigation yes/no, showing posotion on map yes/no.
      You can have a drain of 6%/h up to 13%/h. L-B-L = 274 km and some climbs. That means 12-16 h on the bike. Without a small powerbank no way..The ROX allows a power save display off function, this might help, but was not tested.

      Best regards

    • Yiannos

      Hi Axel!

      This is a very helpful explanation! Thanks!
      Allthough I like all the extras on the Sigma, I am quite ‘afraid’ of buying because it is a new device that needs improvent?
      In any case I will have a power bank with me on rides like LBL.

      The Wahoo Elemnt has good reviews, only no rerouting and the ‘draw a route’ (which seems nice). There are also still issues with TBT, but navigation seems good even in black and white screen.

      I will make my choice soon 😁

      Thanks again.

  85. Jeffrey C. Mirsepasy

    I just got my Rox 12 yesterday. Going to go for my first ride today. Did you have trouble pairing it with Garmin sensors? You said it was supposed to be compatible but I can’t get them to pair.

    • Hey Jeffrey,

      As long it is an ANT+ sensor it should work. Which sensor did you try to connect?

      Did you promt “Search All” or search for a dedicated sensor? If the sensor is activated, search all is the easiest way to start the pairing.

      If you still have some issues, please contact our customer service: kundenservice@sigmasport.com


    • Jeffrey,
      Try this: Home > Settings > Connect Sensor > Paired Sensors > Heart Rate ID ???? > Show Sensor Details > RSSI (signal strength): -40 thru -44 is excellent. If the number is lower (-70 or so) then you may have a low battery problem or a pairing problem.

  86. Richard Stum

    I am currently uploading tracks to the ROX 12 via the Sigma Data Center app on a desktop computer via a USB cord…no problem. Is there a way to upload a track to the ROX 12 which is currently found on the SIGMA LINK app on an iPhone instead? I enabled the hotspot function on the phone and used both the Data Sync > Sigma Cloud > Resync and also SIGMA CLOUD > Sync. Data, but to no avail. (I have used the hotspot successfully to upload a ride when I’m away from any WiFi, so I know the hotspot is functioning.)

  87. Richard Stum

    I’m a ultra-distance roadie and travel in areas where I need the navigation features. Since the audible beep “turn” feature is only 70-80% effective, I have to ride with a navigation map always up. My number ONE COMPLAINT with the ROX 12 is the navigation maps are hard to see in most daylight conditions, especially early or late in the day when the light on the screen is skimming across it and not directly hitting it. I am using polarized sunglasses. The red “follow me” line against the dark green background field makes it difficult to see surrounding streets. A light-colored background, as found on the default setting for Google maps, WOULD HELP IMMENSELY. I have the screen brightness turned all the way up, but then I barely get 7 hours of use before the low battery (25%) warning pops up. Zooming in a lot helps, but then I can’t see what is up ahead. Also, have a zoom scale number, like the ROX 11 has, would help when zooming back and forth (I don’t use the auto zoom feature).

    • cedric

      Hi Richard,

      I also find the navigation colours difficult to make out, It’s a shame we can’t change them like on some Garmins.

      What I did was change the display Color Mode to Night and that helped me a lot.

    • Hi Richard,
      Thanks for your feedback. This is quite helpful. We figured out the same issue and will improve the colors with the next update. After that, we will check how to improve it further.
      The zoom scale will be added in the next update as well. The release will be ready soon.

    • cedric, some time ago, I tried the night mode, but I didn’t care for numbers-only fields that way, but will try it yet again. Thanks for the reminder. Daniel, that is great news, I hope that the update happens before I switch to something else, like an Wahoo ELEMNT with its very clear B&W screen. With the ROX 12 screen at max brightness, yesterday, while on a gravel ride, the low battery indicator popped up after only 5 hours! Attached is a photo of how dark the screen appears. I put my hand in the shot for reference. This photo was taken with an iPhone X and it’s quality camera. The issue it not just screen brightness, but contrast in the map, due to the map style.

  88. Jeffrey C. Mirsepasy

    Did anyone figure out how to enter an address with numbered streets?

  89. Yiannos

    Bought my Sigma Rox 12.0 today and encountered a major problem right away.

    I am planning a 24hrs race soon of aprox. 490k.

    I uploaded the gpx-file (downloaded from Strava) and here’s what happened:
    1. When i chose ‘routes’in the menu of the device I got the following notification: #dialog_track_s_napping_failed
    2. in the navigation menu on the device I got the following notification: Track is longer than the maximum allowed 300k!

    I have imported the file in Komoot and tried it again, but failed! Also I find it very disappointing that you can have a connection of Kommoot with the Rox, but in order to work you will have to pay for regions!

    What seems to be the problem?
    Will this be tackled in an update or is this a restriction on the device? Do other brands have similar problems on long routes? Should be unacceptable.
    If it is going to be the latter, I will send the device back to the store.

    Help is needed here.

    Best regards,

    • Matt Rick


      I queried this earlier in the thread, here is the reply.

      “If the device has to do the routing by itself, the max. length is 300km. If you already planned a route (.gpx file) you can put it to the device an use it (e. g. 700km).”

    • Yiannos

      Thank you for your reply, but I have read this comment.

      Still, it is a planned (gpx) route and does not work. It notifies me of the issues as I mentioned in my original comment.

    • Yiannos

      I think I have a bug in my device!

      I have tried all the routes I have imported on to the device, all different distances. It even gives the notification ‘Track is longer than the maximum allowed 300k’ of a distance of 39k!!!

      What is wrong here?

    • Hi Yiannos,

      I prepared a short video for your reference:
      link to sigmasport.box.com (this video link is valid until 1st of Oct.)

      Here you can see a track which is about 700km long. I takes some time to prepare the snapping (and at the end it failed – in fact of the length), end of the day you can see it works like it should. You can select the closest or start point to start the navigation. Without any problem.

      If you still have some issues, please contact us: kundenservice@sigmasport.com


    • RickH

      This is a concern for me too. Riding brevets up to 600k over two days. If the Sigma ROX 12 cannot accept a GPX route for this distance I have to wonder why there is a limitation. It isn’t a big file for the processor to handle.

    • Richard Stum

      RickH, I also do a bunch of randonneuring. I purchased the ROX 12 after finishing our series for this season. Just now, as a test, I just uploaded a 800km route onto the ROX 12 w/o any problems or delays. I had it start near my house and proceeded to navigate or follow this route. No problem thus far.

    • RickH

      Thanks Richard. There is a lot about the Rox I like but some of the comments are a little confusing. Can you tell me what type of file it accepts? (fit, gpx, tcx)? And, is it fussy where the file is created.

    • Richard Stum

      I do all my route creation on Ride with GPS and export my files, using their default settings, as a GPX file. I then import this file into the Sigma Data Center app on an iMac and push it to the ROX 12 via a USB cable. Daniel…or others, is there a way I can upload a route that is in the Sigma Data Center (cloud) onto the ROX 12 WITHOUT using a desktop computer (using an iPhone)?

    • Hi Richard,

      Actually there are the following options to push a .gpx file to the ROX 12.0 without using USB?

      Today we are integrated Strava (Routes), GPSies and Komoot. You can create a Route in the mentioned websites or simply take your .gpx file and import it to one of the mentioned website (e. g. GPSies is free). Once it is imported, you can simply sync it with your ROX 12.0.

      We are evaluating other options already, which could offer a more generic solution. We will offer a soltuion in midterm.

      Hope this answer your question.

      Best regards

  90. Jeff Cushin

    Ray I bought the sigma after reading your review, did you ever have a problem with it calibrating with your powermeter. I’m using a power 2 max ngeco, a d on the ng app I get a consistent 0 offset value but on the rox I get calibration failed. I contacted sigma a d they were aware of the bug a d it will be fixed in the next firmware update in mid-October, I just wondered if you encountered this at all.


  91. Yiannos


    Is it possible for the Rox for the display to turn on when approaching a turn during navigation mode?
    Someone told me this is possible but I can’t find how. I have done couple of rides with screen always on.

    Best rgds

    • Hi Yiannos,

      This is not possible, yet. But we will check if we can add this feature in future. Actully you here just the sound for the turns, but the displays stays off.

      Best regards

  92. RickH

    From a safety standpoint I find phone notifications questionable whilst out on a ride.
    Am I missing something about this function?

    • Shane Kloepfer

      Will the Rox 12 handle 100 Strava Live Segments yet?

    • Hi Shane,

      We will inform you here, once the update is ready. So today it is still limit to 30, but it will increased soon!

    • usr

      Actually checking your phone is far more dangerous. The value of notifications is that they make it easy to ignore those messages/calls that you can ignore when there can be some that you need to answer (e.g. something directly ride related)

  93. Bestevaer

    Is it possible to sideload apk’s on the Sigma Rox 12.0? Because it would be great to run TrainerRoad native on a bike computer…

    • Hi Bestevaer,

      No this is not possible. Actually there is no plan to doing this in future. Sorry.

      Best regards

    • Seth S.

      Daniel, with respect, what is the point of using an Android based ROM/OS if not to be able to install APKs at some point? I’m just about ready to buy the ROX 12, but your reply above has given me pause.

    • usr

      The point of building on top of Android is that writing an OS is hard, sdopting Linux to tiny battery powered devices is hard, building a productive application UI framework is hard, training new hires to work in that kind of environment would be hard and building on top of Android is giving fitness device makers all that for free. Without leveraging Android, no company besides Garmin would have been able to reach full mapping capabilities because all development resources would be tied down reinventing basics like filesystems, touch UI primitives, battery management and so on.

    • Hi Seth,

      Thanks for your concerns. We fully understand your point of view. “usr” describt it in a perfect way…

      End of the day the whole OS is totally customized and there are only some parts left from the stock OS. You could even call it Sigma OS based on Android.

      Thanks for your understanding.

    • Hi usr,

      Thanks for very good explanation.

      Best regards,

  94. Christian Bratina

    Has anyone compared a Garmin 800, Garmin 1000 series, and the Sigma ROX 12 in the rain? When cycle touring, my Garmin 800 goes haywire after several hours in a light rain. After which it can take a week of warm sunshine to return to normal.

    • cedric

      I went out for my first session in light rain yesterday – for about 2hrs.

      After 30mins my barometer went haywire and it stopped recording gradient and altitude properly.
      I was a bit annoyed, as I was doing hill-repeats.

      I got home worried that the barometer had fried – like the Hammerhead Karoo did to me, but I had to do a reboot to get it back working. Strava allowed me to recompute the real altitude, so all was not lost.

      It’s a bit of a worry though!

    • cedric

      …just to add, I have a Garmin 1000 and it has seen plenty of rain and snow with no problems with changing weather

    • Paul S.

      On all devices with a barometric altimeter there’s a hole that lets outside air in so that the pressure inside the device where the sensor is and outside is the same. If that hole gets blocked by water, which can happen in the rain, then the inside and outside pressures are no longer the same and the sensor can’t detect altitude changes. That’s probably what happened. They usually start working again once they dry out.

    • Hi Paul,

      Thanks for the very good explanation.

      The metioned “hole” is covered in from the ROX 12.0 shell. So it is protected, but for sure it is still possible that the hole gets blocked. Good thing is, it will recover by itself.

  95. Hi @all,

    I would like to make an announcment. There is a new update available. Please check how to get the update and what have been changed here:
    link to sigmasport.com

    Enjoy your next ride! 🙂

    • Richard Stum

      Thanks for the notice Daniel. With a connection to WiFi, I plugged my 12 into a power source (not my desktop computer) and waited for several minutes. I did not get an update or download symbol. The “Installed Firmware” on the ROX 12 says I am current with 35016, yet your website indicates 36391 is the latest. Is this update not activated yet?

    • Timo

      I got the new firmware straight away. You may want to try a different WiFi connection ie hotspot through phone.
      Found 1 issue so far with gpsies. After logging in I don’t see any of the routes in my account. I should see 11, of which 2 are public and 9 are private. None are available to me. Interested to hear if anyone else has this.

    • Timo

      The GPSIES is solved. Routes have to be added to the notepad (kladblok). Sync again and the routes (in notepad) are visible, both private as public.

    • Usage updates:
      1) I got the firmware update to “take.” Afterwards I did a 200km ride with several turns (link to strava.com). I will say…the turn-by-turn navigation is MUCH better now. 2) When I was navigating with a map up on the screen and my head or body casts a shadow on the unit, it is still very difficult to see the map—however when I tapped the screen, it brightened up with the auto backlight function (for 2 minutes as per my settings). So now, I don’t leave the backlight on constantly, greatly increasing the battery life. For this 9-hour ride, I still had 40% of the battery left.

    • Hi Richard,

      Thanks for your feedback! We spent a lot of work to improve the turn navigation a lot! We are happy it worked out so good! 🙂

      Enjoy your next rides!

  96. Jeff Cushin

    Did the update a d my rox still wont perform a calibration, it still fails

  97. Seth S.

    I received my ROX 12 the day the big update was released. How was that for propitious timing.

    I came from the Hammerhead Karoo which has a terrific display but woefully underdeveloped software and a company whose relationship with honesty is fast and loose. Done with them now. Delighted to have a highly functioning device that is well thought out and works as it should.

    Two questions for SIGMA’s Daniel: when will the sd card slot be functional? Support tells me to look for an announcement from you here. The other issue: navigation works without issue but there’s one function that has become a safety issue for me. When I’m crossing four lanes of traffic here in urban Tucson Arizona USA to make a left turn I need more than a 150 yard notice. (150 yards = .14KM) I hope I’m not out of luck with that request, but IMO it requires modification or the option of a longer heads-up to the next turn.


    • Richard Stum

      I agree. Sometimes the turns sneak up you. Last week I discovered a new field available for the ROX 12. Maybe it was there before, but I didn’t understand it. It is “Track View.” It is on my Sport Profile > Navigation Page and I put it in the lower left-hand field. It gives you the distance & direction of your next turn. Maybe this will help with your problem.

    • Hi Seth,

      Actually we are still working on the last “2%” of the solution of the SD card. Technically it is working, but the issue is more related to the SD cards itself. There are so many SD cards available which causes issues. That’s why we decided to remove it from this update. We’ll keep you update about this process.

      Thanks for your hint regarding the turn instruction. Richard already provided the solution we had in mind, to have a save trip in all cases. So you can add the Turn Instruction to any training view. There is even no limit for the size of the “cube”. I just enclosed a picture, how it could look like in a small cube.

      Please let me know, if this suits to your needs.

      Thanks in advance!

    • Hi Richard,

      Thanks for your perfect help!

      Thanks for the hint, for the “wrong” translation in the DATA CENTER. This should be named as “Turn Guidance”, like it is in the ROX 12.0. We correct it asap.

      Thanks 🙂

    • Seth S.

      Thanks Richard and Daniel for the tips and the update.

      Let me make this modification and will post back .

    • Seth S.

      Indeed it (Distance to turn in data field) worked. Thanks again Richard and Daniel.

    • Erwin

      Hi Daniel,
      It is possible to upload/use TOPO cards or use TOPO cards saved on the SD cards?

    • Hi Erwin,

      No you can’t use any other map format on the ROX 12.0. Sorry.


  98. Froze

    Great review DC Rainmaker as always. I watched a YouTube thing you did which was also good but it wasn’t on the Sigma, and the comments were all negative toward the gear, which were 3 models of the Garmin and Wahoo, so I was thinking great I’m not paying $500 or so for a GPS so I can tour with it and not have it work, I’ll just buy paper maps from Adventure Cycling and the maps would be cheaper and use my phone if I need something more detailed, but now you peaked my interest in the Sigma; so I have to check this one out further. I’ve actually own a Sigma computer and it’s lasted so far 15 years whereas the others I have only lasted 5 to 8 years, so Sigma seems to be pretty robust designed hopefully this unit is like those. I don’t need the Sigma to do a lot of what it does, but being a bike computer and have accurate map routing is a must, the rest is just fluff for me.

    Thanks for the review.

  99. chup

    How’s Traditional Chinese support? Does it accept Traditional Chinese search query for navigation?

    • Hi Chup,

      Unfortunately there is no support of Traditional Chinese search query for navigation. If there is any change expected, I’ll let you know.

      BR, Daniel

    • chup

      Appreciate your prompt reply. Hope to see Chinese support in the near future (and possibly CJK input support).

    • AYKO

      Thanks for your reply. Does it mean the device could not display Chinese or Japanese characters in maps?

    • Hi Ayko,

      it can display characters, but you can’t use it for the input when searching for an address.

      This is how it looks like.

      Best regards,

    • Ayko

      Thanks for your quick reply. That’s good enough for my usage and I am sure I would get one after my poor experience about Garmin devices. My Garmin cycling computer and watch usually get bad firmware updates with broken functions. I really wish ROX 12 will be more stable and every promised functions could work.