hi, you can’t flip the bike yes but it’s not the case for cars. we apply an external force to keep the bike up and it can interfere with the overall motion. cars on the other hand should easily flip but most of the time we keep the center of gravity close to ground which makes it difficult to flip. that’s intended behavior and can be changed. can’t say the same for the bike though, bike assist is a demonstration and you’re encouraged to roll your own solution if the bikes are an important part of your project.