STRYD (above) – It’s a running power meter based in a proprietary, multi-band HRM. Good integration with the SPARTANs. It just ‘works’ if you ONLY PAIR it as a HRM.
ESSENTIAL READING: STRYD Review
Running-power data also gets shown as all other ‘normal’ metrics on MOVESCOUNT. I expect to play more with STRYD and SPARTAN over the next year.
4iiii Viiiiva V100 – It’s a caching HRM that also converts ANT+ signals to Bluetooth LE ie for the Spartan. I had a bit of trouble getting this to work. With firmware v1.2.0 it seems to work, before it did not seem to work. Unlike the STRYD I had to pair it BOTH as a HRM and as a bike POWER POD. It will not cache for the SPARTAN, only for the 4iiii app (which you can export data from).
ESSENTIAL READING: 4iiii Viiiiva V100 Review
As the (poor) image below shows, power IS transmitted to the SPARTAN from my ANT+ -only PM via the Viiiiva V100. There appeared to be a delay in the SPARTAN picking up the power levels compared to the 3s power levels on the 820 – but that could be the fault of the 4iiii which seems to be stuck on an old firmware version that I can’t upgrade from.
Cadence did seem also to get passed through to MOVESCOUNT when I FURTHER PAIRED it as a bike pod. The HR seems to be missing today, whereas last night it was definitely working. I’ll update this post with more testing.
The Viiiiva also supports footpods. I had problems with the Viiiiva feeding a Polar V800 that data and haven’t tried with the Suunto. I might if anyone is interested.
So I’m a bit confused about this behaviour. The STRYD pairs as a HRM and then silently and simultaneously pairs as a PM. The Viiiiva seems to be required to pair for each sensor type.
Having said that I’m confused I guess it does not really matter once you have it set up.
Interesting point: I expect Polar to bring out a product with similar bridging functionality very soon. Read this: Polar H7i. This will almost certainly work with the SPARTAN too.
Recommendation: Don’t buy an ANT-only PM on the basis of this post for your SPARTAN!! It should be OK tho.
Last Updated on 15 January 2026 by the5krunner
My favourite kit and nutrition
- Maurten — the race nutrition trusted by elite athletes. Gels and drink mix engineered to be easy on the stomach.
- Garmin 90-degree charging adapter — the small adapter that keeps your charging cable tidy at the stem. Essential for race day.
- Garmin charging puck — the fastest and most reliable way to top up your Garmin before a session.
- Ravemen FR300 — front light that mounts directly under your Garmin or Wahoo head unit. Keeps your bars clean and your beam pointed where it matters.
- Garmin Varia RTL515 — radar rear light that alerts you to vehicles approaching from behind. Pairs with your Edge or Garmin watch.
- Stryd — the footpod that brings running power to your Garmin. The single most useful running upgrade I have made.
- Favero Assioma Pro RS2 — the power meter pedals most serious cyclists end up choosing. Accurate, easy to move between bikes.
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tfk is the founder and author of the5krunner, an independent endurance sports technology publication. With 20 years of hands-on testing of GPS watches and wearables, and competing in triathlons at an international age-group level, tfk provides in-depth expert analysis of fitness technology for serious athletes and endurance sport competitors. ID
