Garmin just released true-up like a week and half ago which will synchronize your bike workouts recorded on your 520 to your 935. This was never possible until recently. My 935 now shows all my bike workouts even though I don’t even wear it during my rides. I just had to update my 935 to the latest software and ensure true up is enabled on the 935 (settings then physiological metrics).

As far as getting your 935 optical hr to the 520, you have to put the 935 in broadcast mode to broadcast the hr out. But honestly, optical hr sucks and is inaccurate. Chest strap is a better long term solution.

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