Hello to you, :)
I use an Edge 520 in the last couple of months and still have not managed to configure a wheel-size (circumference) in the speed sensor for indoor training. I need to define a circumference of 2,025 mm. not ~2,100 like in the road bike, speed is measured by GPS.
I do not have the wheel size config. option in my Edge 520. Garmin support have instructed me to do it via the Connect Ap. though I do not have the wheel size parameters for change there either.
I upgraded the SW to 3.6 in the Garmin Express on my computer yesterday, did all possible sinc's though the version of Garmon Connect on my mobile remained 3.5.. - if this matters.
Will appreciate your help on that :)
Thanks!
npr50