Speed data being calculated from indoor cycling

I use trainerroad and I've decided record the sessions via the 5X because physio true-up doesn't work on sync'ed activities.

Using a kickr snap in ANT+ mode POWER only

wahoo cadence sensor and HRM both ANT+

there is no speed sensor involved and no speed data comes from the kickr snap

i can see in the fit file that only those 3 sensors, plus the internal temperature, were logged.

how/why did garmin calculate a "virtual" speed ?

anybody any idea ?

0 mcalista over 6 years ago

The ANT+ FE-C protocol used by indoor trainers includes speed broadcasting. It is the kickr calculating this, not Garmin.

0 s_orange over 6 years ago in reply to mcalista

(to update my own question) close but not quite :)- I wasn't using the FE-C profile just the POWER profile as per my original question, which is why I didn't understand it BUT on the kickr range the power only profile also has speed baked in

Thanks for pointing me in the right direction.