I had the same questions, then I googled and found (1) this post and (2) hundreds of articles on "how to count steps when cycling". Then, I understand Samsung does this conversion and adds the steps, as a way to count the biking as a low/mid intensity activity to our days. I can't say for the preciseness or their exact formula, but I that seems like a good bet.   I also noticed both devices count the steps similarly - if you go to the steps screen on your phone, you'll see on the menu an option to show just the phone's steps. In my case, I had 16XX when I biked for ~2km, and 17XX when the watch steps were enabled on that graph. Here's one of the references: https://authorvinod.medium.com/how-to-convert-bike-miles-to-steps-here-are-the-4-easy-methods-192383ff1f42 ... View more