- When watching from a side view, you can see the bike bounce and pitch in a forward lean direction with each heavy pedal stroke. It pivots from a point behind the bottom bracket and is not what we get with other smart bikes or a regular bike with two spaced contact points outside or on a trainer setup.
Here is a quick sketch to show the direction of angle motion, since there is no front support:
The following videos are what I could find from a quick search, but not sure they are the ones where I first saw the issue.