the Hammerhead Karoo 2 Review – Garmin Killer

Hammerhead Karoo 2 Review

So good to look at, so full of features, a good battery and with the best screen any lycra-wearer can ever want to own, that’s the Hammerhead Karoo 2 and this is my review of it, warts and all.

Hammerhead’s new performance bikenav ticked all the boxes that weren’t ticked in the original version and then went back over the boxes that were already ticked and added some extra-thick, super-sized green ticks. The new Karoo 2 is now more compact, faster, has an even better screen and a wholly new audio beeper! The onboard SIM can now be 4G and some of you will love the USB-C charging and beefed-up storage capacity for maps, there is some market-leading tech inside it.

Hammerhead Karoo 2 Review Summary

I’ve put the review highlights into this summary of my time with the Hammerhead Karoo 2, please scroll further down for plenty more detail. Buying via the Hammerhead banners supports the work here with a small commission, thank you.

Hammerhead Karoo 2 Review
  • Price - 90%
  • Apparent Accuracy - 95%
  • Build Quality & Design - 95%
  • Features, Including App - 90%
  • Openness & Compatability - 90%

Karoo 2 | Verdict

I love the Karoo 2 and can recommend it as easily as I can recommend a Wahoo ELEMNT or top-end Garmin Edge.

Hammerhead Karoo 2 Review

The Hammerhead Karoo 2 is a high-end GPS cycling computer that offers a wealth of features and capabilities to enhance your cycling experience. The device boasts a high-resolution, colour touchscreen display that is easy to read, even in bright sunlight. The interface is intuitive and easy to navigate, making it simple to access all the data and metrics you need while cycling.

One of the standout features of the Hammerhead Karoo 2 is its comprehensive mapping and navigation capabilities. The bike computer comes preloaded with detailed maps of most major roads and cycling trails, and it allows you to easily create and follow custom routes. The device also includes turn-by-turn navigation, which is a great help when cycling in unfamiliar areas.

Another impressive feature of the Hammerhead Karoo 2 is its ability to connect to a variety of external sensors, such as power meters, heart rate monitors, and speed/cadence sensors. This allows you to track a wide range of data and metrics, including power output, heart rate, and more, which can be very useful for training and monitoring your progress.

The Hammerhead Karoo 2 is also built to last, with a rugged, waterproof design that can withstand the elements and the rigours of off-road cycling. Its battery life is also impressive, lasting up to 40 hours on a single charge, which is more than enough for even the longest of rides.

Overall, the Hammerhead Karoo 2 is a top-of-the-line GPS cycling computer that offers an unparalleled combination of features, functionality, and durability. Whether you’re a serious cyclist looking to train and race at the highest level or a recreational rider looking to explore new roads and trails, the Hammerhead Karoo 2 is an excellent choice.

For 95% of riders, Karoo will do an excellent job.

Price: US$399 / £359


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  • Superior hardware all around, market-leading screen
  • Superior interface experience
  • Great performance features, including new CLIMBER feature
  • Side-loaded apps give the likelihood that any missing features can be filled in style from existing 3rd party apps
  • Good navigation package with onboard maps and (re-)routing by address
  • Supports innovative ways to curate and load routes from multiple sources
  • Synchronises and executes complex, power-based, indoor training plans
  • Supports all commonly used 3rd party sensors including Di2, FE-C and Varia
  • Several types of smartphone notifications can be configured
  • A SIM card means you can leave your phone at home.


  • PM calibration is somewhat hidden away (annoying)
  • Like Wahoo, Hammerhead expects you to perform your post-ride analysis elsewhere (Strava, TP, etc). Solution: side-load an app!
  • Sensors not active for a few minutes are ignored. Post coffee, that’s annoying
  • It’s expensive but $200 less so than an Edge 1030+ which isn’t worth the extra
  • I get just over 10 hours of battery life, I’d like more but can live with that
  • Complex on-device route creation isn’t yet possible unless you side-load another app (side load an app instead)
  • No trainer workout customisation pages (niche, sideload an app instead).

Hammerhead Karoo 2 Review

Garmin Edge 1030 Plus will remain the King of the obscure feature list but, you know what? Hammerhead’s Karoo 2 probably has all the features you need and want plus quite a lot of other ones too…just in case. Even better; Karoo 2 packs that impressive feature list into a beautifully designed shell with the very best screen and the most awesome software interface.

That’s why the Karoo 2 is a genuine Garmin-beater, it’s simply a joy to use.

Comparison Hammerhead Karoo 2 vs Wahoo ELEMNT

It’s best to first compare Hammerhead’s Karoo 2 to a Wahoo ELEMNT Bike computer as both rely on the complex stuff like training plans, structured workouts and analysis being accomplished via a 3rd party platform. In my opinion, that’s a great model. Where Wahoo ELEMNT and Hammerhead Karoo differ is that Hammerhead wins with good web-based route functionality whereas Wahoo’s app wins as is has the simple reporting that Hammerhead lacks, furthermore, the ELEMNT app is where the Wahoo ELEMNT is configured and that keeps the ELEMNT’s menus on the bike computer nicely simple.

Comparison Hammerhead Karoo 2 vs Garmin EDGE

I’ve used Garmin Edge and Wahoo ELEMNT bike computers for years and I’ve cycled with the Hammerhead Karoo 2 for thousands of miles in preparation for this review. They are all accurate enough and they all connect to the external sensors and bike trainers that everyone uses, sadly they’re all relatively expensive. Yet the Hammerhead Karoo and Garmin Edge surge ahead of the ELEMNT when it comes to quality mapping and turn-by-turn (re-)routing.

Both Garmin Edge and Hammerhead Karoo undertake all the settings on the bike computer and that’s great when you need to make a change during your ride but, as the months go by and the new features pile up, that approach adds ever-increasing complexity to the interface on your handlebars.

Because Wahoo has offloaded complexity to its app, it means they should always be able to deliver a highly usable bike computer experience. Still considering usability, Hammerhead beats the Garmin Edge every time…the usability of the Garmin Edge is like a car crash, with 3 different interfaces and menus scrambled together in what can often best be described as a visual mess of sprawling blandness with an occasional moment of genius.


Hammerhead Karoo 2 Specifications

No review is complete without an exciting list of specifications, so here is the full splendour of those for the Hammerhead Karoo 2.

It has a bright screen, updates over WiFi/cellular and is effectively a smartphone running custom apps on Android 8.0 ‘Oreo’ (2017)

  • Dimensions: 98 x 72 x 28 mm (3.8″ x 2.8″ x 1.1″)
  • Weight: 131g + 36g (mount)
  • Screen: 1.1mm Corning Gorilla Glass cover, 3.2″ diagonal (2.10″ x 2.80″ or 53.28 x 71.04mm), auto backlight
  • Interface: 4-buttons and/or capacitive touchscreen
  • Resolution : 400x800px @ 292ppi
  • Storage: 32GB
  • Onboard sensors: Barometric Altimeter, ambient temperature, gyroscope, magnetometer, accelerometer
  • Battery Life: 3200mAh gives up to 14 hours, realistically it’s more like 10 – with re-routing eating further into that. 3 hours to recharge. BE WARNED some chargers/adapters do NOT fully charge Hammerhead and Wahoo head units (eg Apple chargers)
  • BLE/ANT+ Sensors: HR, FE-C, cadence, speed, power, Di2 (shifting and buttons), Varia Radar
  • Charge Port: USB-C, IP67
  • GSM Cellular: SIM slot 2G, 3G, 4G (or pair to your phone for notifications)
  • Platforms: Training Peaks, Strava, Komoot, RwGPS, Xert

Full specifications:

Hammerhead Karoo As a BikeNav

Garmin has the most in-ride navigational features yet, in my opinion, the straightforward navigational experience with Karoo 2 is superior. It sweetly ticks all my boxes. If you have more complex guidance needs then Karoo often does not address them – for example navigating to the start of a route.

Hammerhead Karoo 2

You’re either buying this Karoo 2 because you want something a great visual experience on a performance bike computer or you want a market-leading navigational experience. In this section, let’s assume it’s the latter and here are some of the many navigational highlights you can expect.

Creating & Curating a Route Library

I’ve liked and loved Hammerhead’s online route platform for a couple of years now. It’s a given that you can do the basics like uploading a FIT file or linking and syncing routes from Strava/RwGPS. However, you can do other cool stuff, like this

  • Cut and paste a URL that displays a route eg from Google Maps!
  • Use Hammerhead’s Chrome Route Grab extension to, err, grab routes…super quickly. Like, with ONE click.
  • Simply share your routes with friends with any media whilst simultaneously understanding which route you are using from which source platform

  • Online route creation HAS been improved over the last 18 months and, for me, it now creates good London-centric routes but periodically misses when some commonly-used paths are available. Like other platforms, you can choose, maps, surface type and see the elevation profile.



Hammerhead offers a rich navigational experience that ranges from grabbing routes from Google Maps or automatically syncing them from Strava/Komoot/RwGPS. I like the online route creation tool and the quality of route choice HAS improved since first implemented on the first Karoo and, at least where I live, I would now say it create mostly correct routes. Hammerhead lets you curate your own online route library which is a joy to visually manage and easily share with friends and one other aspect that stands out is the instantaneous nature of it all if you change a route or Hammerhead’s platform or even on Strava then, almost instantly, you’ll find it simply appears on your Karoo 2 via WiFi.

Following a route

Street names and turn-by-turn instructions are only part of the in-ride experience with Karoo2. As this short video shows, re-routing and coloured chevrons give you an instant understanding of your status on the route.

That said it’s not perfect. Hammerhead is trying to ‘keep things simple‘ and some, more complete, on-device features don’t exist – for example, you CAN navigate to a specific zip/postcode on the Karoo 2 but you can’t create a more complex route via a second post/zip code, although you can add waypoints. How often have I wanted to do that?…never.

Similarly, if you want to create a highly tailored navigation screen then Karoo 2 does not have many weird and wonderful navigation-specific metrics that you will find on a Garmin Edge 820.

The solution is to side-load your favourite Android navigation app, like RwGPS. Of course, if you choose to use RwGPS or STRAVA on your Karoo then you also get popularity routing and heatmap-driven routing respectively 😉 Sweet !

If you want multiple pieces of obscure navigation functionality then the ONLY solutions will ONLY EVER be either Garmin or Android (Karoo!)

Karoo 2 As a Performance Bike Computer

Karoo 2 is a great performance bike computer. This doesn’t mean you’ll be using it in the TDF it just means that it is very well designed to be able to support anyone striving to do better. So it definitely gives you all the common performance metrics that you need from power meters, speed-cadence sensors and heart rate monitors. Normalized power, upcoming hill profile, fancy dials and displays galore…you have zero need to worry about ANY of that. In fact, you will be excited that there are new and innovative ways to display some of your in-ride data. Innovative ways that you have never seen on your mates’ Garmins.

I’d count Strava Live Segments as a ‘performance’ feature and the Karoo 2 beats Garmin on this one with great on-screen graphics that support your PR attempts. Here is a detailed comparison of the Strava Live Segments offerings of all the major vendors – Karoo wins BTW. If you don’t want to click that link, here are 4 pretty, animated images!

If you want the speed and certainty of Di2 shifting then Karoo 2 gives you all the key goodies: the ability to change Di2 shifting profile; support for hood-top Di2 buttons and just in case you’re not sure what gear you are in you can visually display your gear (below). There are other Di2 metrics like shift count but none are written to the FIT file.

Hammerhead Karoo 2 Review

If you have a power meter then advanced dynamics are supported for display and recording namely LR Balance, Pedal Smoothness and Torque Effectiveness (PP, PCO)

Indoor Workouts with a Smart Trainer

Karoo 2 quickly syncs to 3rd party training plans and further supports custom workouts that you might create on, or load to, Training Peaks/Xert. These workouts control modern smart trainers using ANT+ FE-C. The only downside here is that you can’t store your favourite workouts on your Karoo, instead, you have to, for example, store them on TP and sync from there. Hammerhead is working to resolve that minor issue.

The structured workout execution screen is ‘fixed’ at the time of writing, meaning you can’t change what’s displayed. So for now, you still see the target power profile, actual power and you have the ability to pause or skip through phases of the workout. I’m less concerned about trusting Hammerhead to add the ability to change the screen than I am that you can only manually move between workout phases by pressing a tiny part of the screen area. My experience from using a Wahoo ELEMNT for indoor training is that it is very much easier to press a big knobbly button when you are fatigued & sweating profusely.


Hammerhead Karoo 2 Review

Your completed workouts are easily synchronised to analysis platforms like Training Peaks and social platforms like Strava. But before that happens, your workout summary screen adds some nice touches by enabling you to name your workout before choosing which platforms to synchronise with.


The Karoo As a Smart, Bike Computer for everyone else

By ‘smart’ you might mean properly handling and presenting traffic alerts from a Garmin Varia Rader then, yep, it does that REALLY well. If smart means handling Di2 then that’s pretty awesome too and you can even choose the Di2 shifting profile from with the Karoo itself!

But smart doesn’t end there. Oh no. As Karoo 2 is essentially an Android smartphone you can load up smartphone apps to work alongside the usual Karoo interface, you can load Xert, RwGPS to Zwift or just about any app.

Not everyone takes a phone with them when they ride. I don’t! If I put my Sim into the Karoo then my loved one could track me and I could install Whatsapp to use if I needed bringing home and Spotify to listen while I wait.

Hammerhead Karoo 2 Accuracy Review

It’s Accurate

I used to spend a day putting together GPS comparison imagery and writing it up. For most bike computers GPS accuracy comparisons are wasted time and bloat the review size, so I’m now investing the hour+ of analysis with no write-up. Please add a Supporter-request below if you really want to see more.

With GLONASS enabled, the Karoo 2 is equally as accurate as other best bike computers.

Very many Zwifters & London-based cyclists will recognise Box Hill, this image shows a perfect track from the Karoo 2 going up it, which is indicative of almost all other rides. Other devices are sometimes slightly worse than this…not the Karoo.

Box Hill via Karoo Dashboard #Perfect

Whilst Karoo 2’s GNSS is accurate, I have two minor concerns. There are very occasional blips of, say, once in 50km where the track exceeds the +/5m accuracy bounds for a second or so. Secondly, the Karoo Dashboard seems to show a jagged track, I double-checked what was recorded into the FIT file and all was good so I assume the Karoo dashboard simply displays less granular data than the per-second data that is recorded.

Unusual & Notable Extras

  • Karoo 2 has a good and novel mounting system, handily it has an adapter for Garmin mounts too 😉
  • All good bike computers include a lanyard to prevent accidental damage, Karoo has one
  • There is a seemingly exhaustive choice of screen layouts that combine numeric data, dials and charts of all kinds. The metrics that can be chosen for the screens are wide-ranging too and one of the interesting quirks is that when you are setting up the screens, dynamic and changing data is displayed. It’s a nice touch and better help you visualise the end result.
  • Many visual elements relating to the display on your ride data are superior to anything else on the market. There is aesthetic beauty to the design, layout and animation of everything from a heart rate zone display to the progress vs the KOM on your active STRAVA segment. This is all boosted further by the best screen resolution on the market.
  • You can change the order of your paired sensors which, theoretically, means that your power meter can be quickly available to pair or a certain speed sensor is given priority over others.
  • In its standard form, Karoo 2 supports workouts from Xert. However, you can also side-load the Xert Android app for the full Xert workout experience on your Karoo
  • Not happy with the breadth of navigational features? Then why not simply sideload the entire RwGPS Android app and use its navigational features? This approach with 3rd party android apps can bypass ANY minor navigation shortcoming.

Sideloading Apps to a Karoo 2

Sideloading an app is not straightforward but worth a go. You need developer access to the Karoo and sometimes the ‘standard’ instructions for connecting to a PC don’t work as MTP support might interfere. Furthermore, some apps, like Strava, need root/PlayStore level access.

Help Forum: Karoo Users!

That said it took me 15 minutes to install Xert and Ride with GPS, the former to execute structured workouts on a Kickr and the latter to add different routing features. If you add strava you will get half-decent analysis features on your Karoo. Garmin Edge doesn’t do that, although the Connect app does.

This is really clever stuff, the bottom line though is that many of these apps are designed for a slightly larger screen and look and work better on the Karoo 1 (and smartphones).

That said, you should be able to get all these to work perfectly well:

  1. Ride with GPS – for different routing features
  2. Xert EBC – to execute complex plans and control your Kickr
  3. Strava – post workout Strava fun.
  4. Spotify – with earbuds
  5. Whatsapp – for instant messaging. I’m unsure if the speaker in earbuds will work for voice calls


When following a route, Karoo 2 displays hill climb information in a similar way to ClimbPro on Garmin Edge units. It’s a neat feature to help you pace your efforts over multiple hills with some great visual cues that beat what is currently offered by Wahoo.

In a Nutshell – Hammerhead Karoo 2 Review

There is no such thing as the best bike computer for everyone. Wahoo ELEMNT ROAM/Wahoo Elemnt BOLT, Garmin Edge 530/830/1030+ and Hammerhead Karoo 2 each have subtle superiorities over each other.

In one sense, Hammerhead’s open platform approach is like Wahoo’s and links to 3rd party analysis tools, complex route creation tools and social sites. Unlike Wahoo, Hammerhead’s approach is to keep all the device management on the Karoo. That choice has its pros and cons and there is no right or wrong answer for everyone.

However, Hammerhead has a few extremely powerful ways to address the shortcomings that inevitably exist on a small company’s platform. The Karoo 2 is a smartphone and so if you want more analysis, more complex route creation/following or more from structured workouts then, for example, you can load the Strava, RwGPS and Xert apps onto the Karoo. No one else can do that and Garmin and Wahoo NEVER will be able to do that. Android compatibility is the sole reason why Hammerhead might take over the cycling world…or not!

Furthermore, the Karoo 2 is a properly specified piece of hardware, in many ways superior to the iPhone X and probably faster than every other dedicated bike computer, at least it feels that way to me. It runs very smoothly and really powers the beauty of its market-leading screen. Even better than that, Hammerhead’s interface designers have crafted something beautiful to delight your eye.

Karoo 2 is the real deal.

Perhaps the only drawback that can’t be resolved or worked around is the burgeoning array of options on the Karoo 2 itself. Wahoo cleverly keeps those on the companion app and that makes the in-ride experience for Wahoo super-slick. But Wahoo will never rival the looks of the Karoo 2’s screen. Never.

Would I change from Wahoo to Hammerhead? Well, I’ve used it as my MAIN & ONLY BIKE COMPUTER for the last two months. You can take that as a recommendation that you are about to make a sensible decision 😉



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Hammerhead Karoo 2 Discount, Price, Availability, Review Summary

The price is right for a high-quality, mid-sized touchscreen bike navigation computer.

A discount for the Hammerhead Karoo 2 is unlikely until late 2021, Hammerhead simply can’t keep up with demand and has no need to lower the price. There have been shortages and waits for units so please check the current status (links). Proprietary mount and lanyard are included and the Garmin mount was included for pre-order (probably now extra)


Price: US$399 / £359

In the USA: Buy from PowerMeterCity

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33 thoughts on “the Hammerhead Karoo 2 Review – Garmin Killer

  1. Also i don’t know how this is but edge 130 battery life is very shortened in low temperatures… wonder if edge 530 or 130 plus suffer same way… wahoo bolt or roam does not shorten battery life on cold… how this is?

      1. Some battery powered systems only estimate remaining capacity from voltage, others from a combination of voltage and integrated current.

        Cold reduces the observed voltage (“how hard do electrons want to go from anode to cathode” or “pressure”), but cold does not reduce total mAh available (“the number of electrons waiting to go from of anode to cathode”, you could even drop the quotes as it’s literally that number, in an appropriate unit).

        An “estimate on voltage alone” system (or a simple circuit that requires a certain minimum voltage close to what the battery supplies) will decide that it’s empty in the cold long before actually depleting mAh, while a smarter system that integrates current (“that counts electrons”) will go deeper into observed low voltage. But it may still run shorter, is it pulls constant Watts so that it requires higher current in the cold, but this will still result in a less impact from cold than a simple “voltage observer”. Worst of course would be voltage observers that still consume constant Watts (higher current in cold), perhaps the 130 is in that class and others are not.

        Some devices in-between will observe voltage, but also observe temperature to apply some correction factor, because doing that current integration thing correctly requires quite some smarts (particularly wrt how much mAh would actually be available, it’s usually some complex self-calibrating mechanism that includes voltage for determining long-term battery health)

      2. Sure, nobody is unaffected (except for devices that simply use less power at lower voltage like some very cheap rear lights do, but that at the same time do “electron counting” charge state instead of a simple voltage gauge and no cheap rear light will ever go that path).

        But a voltage sensing device will be affected much harder: in some extreme cold where you’d end up seeing 20% lower voltage, an amps-integrating constant Watts device will simply draw 25% higher current do make up for the lower voltage until it runs out of mAh. It loses some runtime but not much. A simple voltage sensing device however will see 3.36V from a battery in a chemical state that would usually show 4.2V and I guess you know enough about room temperature ion battery voltage range to know what that means.

        Real life voltage drops from temperature are usually lower, but the difference is the same: both devices are affected by absolute capacity loss (less Wh from identical Ah), but in addition to that loss the simple voltage sensing device will tap out much earlier than necessary (pragmatic compromise solutions often involve workarounds like measuring temperature to apply some hand-wavy correction factors because amps integration is hard)

  2. I don’t think you get the Garmin mount adapter any more, so you need to budget on another £15 for a piece of moulded plastic.

      1. yes i saw that,ty
        double check, it was included in the pre-order. then it wasn’t going to be included, then this implies/says it is but that might be just some content that hasn’t been changed. please let me know
        btw: did you buy it from one of my links, I don’t see anything (not a problem I just want to check my link is working!)

  3. Hi,

    i wasn’t sure reading your review – is user able to select the power (or any other metric) source if there is a few around? In Wahoo (which is superb for all kind of training) most annoying is that i never know which power/cad source i am using – so i ended up with NOT pairing it to my Saris H2 to make sure i am always training with the same power. This is causing extra headache since in complex, short intervals training, external app on the phone controling H2 is (due to unknown to me reason) desyncing a bit comparing to training pulled to wahoo from TP. Would be great to have a device which lets user select which source is being used (or even better record it from several sources) while still allowing to control FEC enabled devices.
    Do you know which map undelay/provider Karoo is using? On Wahoo I am sometimes not very happy with quality of maps (roads are perfect, but offroad – i’d say a lot to improve) and I’ve been seeing multipple times situation that the trck was running over “not existing” path or single track.

    1. edit:
      Power: You can order the list of PMs. My understanding is that the highest on the list is used. You can further disable a PM as you know.
      The sensors that are paired change colour to green in the sensor pairing menu (effectively same as wahoo signal strength indicator)
      If you are talking about using both a PM and a smart trainer on FE-C then weird stuff can happen
      If you have two devices paired as FE-C then wired stuff WILL happen even with garmin.
      with garmin you CAN record multiple power sources if you get a CIQ power datafield to report a separate custom track. (obviously: or use the wahoo app or other app or other device)

      mapbox/osm are used. you can create a hammerhead dashboard account online without a karoo. have a look!

      1. Any reply from them? Is it possible to record power from pedals while controlling smart trainer?

        A couple of other questions regarding FE-C control and training integration:

        • how HH interprets TP structured training when there is a power range specified?
        • can you modify power in ERG mode while in the middle of planned lap (e.g. add/substract 5w or something – simillar to what wahoo allows)?
        • is there any other control mode available or just ERG?


      2. no reply
        yes you can record from the pedals over ant+
        i don’t have the answers to your question and would have to ask HH
        i assume its the midrange point, i seem to remember you can change the power but not quite as you desciebe it and not as comprehensively as wahoo, just erg…but this is all in flux and will probably change very soon

  4. Tried mine out for the first time on Sunday I am super impressed.
    We had a Garmin Edge 830 with us as to compare and frankly, Garmin should be ashamed.

    K2: I loved the K2 for its clear routing you know where you are going and in what direction. The maps are very detailed showing you bridleways, cycle paths, footpaths etc You have the confidence to take a different route and the K2 will ‘smart’ reroute you almost instantly. Small details like the countdown to the next turn with a bar graph and the name of the road with extra details like ‘take a slight left’. I covered 40 miles and 25 of those were off-road the K2 was like riding with a ‘local’ on my handlebars.

    Garmin: An insane amount of fake turns, constant u-turn nagging on straight roads, re-routing us back to where it thinks we got ‘lost’ only to send us in circles, the route colour and direction can be difficult to see because of other colours used on the map. The very glossy screen. The slow map update often missing a turn because we had already passed it by the time the map updated.

    You’d think Garmin was the new virtually unheard of brand. They really need a massive refresh. Design, mapping, navigation etc. Training, yes it’s excellent.

  5. I’ve owned a Karoo 1 for several years and have been happy with it. The Karoo 2 is lighter, more compact, and has a much better display, so I upgraded a month ago. To compare the Karoo 1 and 2, I worked out with them side by side on my resistance trainer with Wahoo speed and cadence sensors paired to both. Though the workout data closely matched on the head units and on the Hammerhead website, when uploaded to Strava the Karoo 2 distance and elapsed time data was often 1/3 less than actual. I contacted Hammerhead Support some weeks ago, but have yet to receive an explanation or solution. Needless to say, this is very unsatisfactory and if not resolved I will be returning the Karoo 2 and keeping my Karoo 1.

    1. that sounds very strange.
      what was the autopause setting on each device?
      i am having some dropout issues but i think the problem is with my turbo trainer rather than k2

      1. Autopause may be on, but while riding the resistance trainer I am spinning continuously at speed from the moment I turn the unit on until I turn it off. The K2 FIT file is significantly smaller in size than the K1 for the same ride, which is curious, but Hammerhead claims the K2 FIT file is valid. They said they will get back to me in the next day or so.

      2. strava tends not to like workouts that don’t have GPS. there could be an issue there.
        q: what does the hammerhead portal say were the distances compared to strava?
        q: have you uploaded the fit files to platforms other than strava
        I can look at the two fit files if you like. if you do send it to me please be exactly clear on what you expect to see and what you actually see otherwise it will take me quite a while to figure things out.

      3. The ride data for K1 and K2 match on the units themselves, as well as the HH website summary display. Thanks for the offer, but I’ve just downloaded a MacOS FIT file explorer and examined the FIT files and data for both is valid. I discovered the difference between the K1 and K2 FIT files is that the K2 is missing position (GPS) data for about the first third of the workout. Of course, GPS position data is irrelevant for an indoor workout and Strava has an “Indoor Cycling” tab, which is presumably intended to flag indoor workouts. I’ve selected this tab for every indoor workout. Strava removes the map display for the “ride”, so is referencing that tab setting, but they are clearly discarding every FIT record that lacks GPS position info. This is incorrect for an indoor workout and I will be bringing this to their attention. Thanks for your help.

  6. I bought a Karoo 2, having sold my Edge 1030 Plus due to continued loss of GPS connection.

    I have had it for a few days now and like the screen and the hardware. However, it doesn’t feel like a second generation device but like a beta-stage product. Why?

    • No adaptive brightness: HH’s response- no sensor to lower battery consumption
    • No resume later: kept the device on “pause” while taking a break and set off, only to discover at a later stage that all sensors had disconnected
    • No ability to discard a ride- can only save it?!
    • No smart bike support
    • Mobile data on-device: fantastic! What is it used for? Syncing with HH dashboard and…not much else
    • Navigation: GPS issues outside of London, location arrow got stuck a few times+route generated took me through major roads to Epping forest
    • No proper on device route creation- just “go home” or navigate to POI

    I really, really hope that the HH team has a lot of stuff in their pipeline. It would have been helpful to know what they are working on as there is currently no public development pipeline.

    Rant over…I will likely get back to using a Edge 1030 Plus and compare the two side by side. Karoo 2 feels like a massive missed opportunity but I intend to keep it in case things change for the better. A lot of the problems listed above can be made right by software changes.


    1. “Mobile data on-device: fantastic! ” just like apple have the UWM on the AW6, HH have the hardware in place for later features
      They update firmware monthly and have done for a couple of years. They’ve had relatively recent funding round and they are buoyed by recently great sales levels…
      so the short to medium term future should be rosy

      1. I am planning to keep the Karoo 2- unlike the first model that I returned within the first 45 days.

        I am hopeful that things will keep improving because there is a lot of ground to cover.

        I own a cellular AW Series 6 and use the cellular capabilities of the watch in a number of ways.

  7. I’d suggest updating your review based on user feedback. Myself and many others are experiencing ongoing connectivity and software issues (inconsistent syncing with Strava). Most recently I noticed the rear of case was chipped – direct result of the awkward Karoo mount. I’m not the only person experiencing aforementioned problems.

    1. thank you, I was unaware of that and use the Garmin mount adapter.
      I never had any strava sync issues. admittedly i disabled that particular upload channel a couple of months ago.
      Keep us updated with how HH resolve the problem

      I simply can’t keep a log of software bugs and monitor when they get fixed… that’s not the job of a review and I don’t normally include bugs in any reviews for any manufacturer, although I do sometimes comment on them separately. However the hardware issue IS within the scope of a review

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