Question: is garmin vivoactive 3 good for cycling?
Answer: In general though, I'd say the HR accuracy of the Vivoactive 3 is mostly good for running, and a bit mixed for cycling. Which is about the same as I typically find most recent/2017 Garmin optical HR sensors. I prefer lighter watches (FR935/Suunto Spartan Trainer Wrist HR), which in turn helps for optical HR accuracy.