Pairing an Apple Watch with a bicycle power meter?

I use the native “Workout” app on my Apple Watch Ultra to track calories burned during bike rides.


I’m considering adding a power meter to my bike (like Garmin Rally pedals or a SRAM AXS RED spider) that would be able to measure real-time power (either single- or double-sided), and I’m trying to understand whether/how that would work with my Apple Watch. Has anyone done something like this? I’m wondering:


  1. Is it possible to pair (via BLE) one of these power meters with the Apple Watch (natively, not with a third-party app)… like I already do with a Polar heart rate monitor?
  2. Is the Apple Watch Workout app smart enough to actually use the power readings from the meter to make more-accurate calorie calculations? (For example, today, it doesn’t seem to adjust my calories if I’m carrying a heavy load, or in a long ride going into the wind, etc. But a power meter would be able to take that into account…)
  3. Is it smart enough to automatically understand whether the meter is a single- or double-sided one (so that it doesn’t incorrectly double- or half-count the readings)?
  4. Any chance that the Exercise app records power, to be reviewed later? How about left/right balance? How about cadence? Separately, is it possible to display any of these things in realtime on the Workout app on my paired iPhone? (Currently when I’m on a ride and the watch is in Cycle mode in Workout, I can set the iPhone to display key stats like speed, heart rate, etc. … is it possible to also see power there?)


Thanks!

Apple Watch Ultra

Posted on Sep 16, 2024 9:47 AM

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Oct 6, 2024 9:44 PM in response to Mike G.

Updating here in case anyone has a similar question:


Ok I went ahead and tried it out… and everything just worked!


I got a a SRAM/QARQ AXS spindle+crank power meter. Once the power meter was installed (and calibrated using the SRAM AXS app), I could pair it easily with my Apple Watch Ultra via Bluetooth, and I saw power and cadence graphs in my workout history. Yay!


I was also able to simultaneously pair it with my Garmin bike computer (presumably via ANT+), and I found that the calories burned ratings for bike rides are pretty similar between the two (though not identical enough to imply that both are simply integrating power over time to compute energy — in my case the Apple Watch has been reading a little higher than the Garmin.)


Thanks, Apple, for supporting this natively!

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Pairing an Apple Watch with a bicycle power meter?

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