I use the 955 as the default device for multisport, therefore also for the bike. I wonder why, as with Edge devices, the heart threshold is not automatically detected for cycling activities, but only for running. It is a function that I honestly do not understand because it is not implemented. Garmin please implement this feature. The heart rate zones for running and cycling are different. asks a faithful owner of: 310xt / 920/935/945/955 (not counting the Edge). Please.