Originally Posted by
badmother
I was thinking that on a 20" bike going at 15 km/h the top of the dynobottle is going to turn much faster than on a 28" bike going at same speed, same as you said.
Wait. That's not what I said. (Or at least not what I meant to say). The top of the dynobottle will turn the same speed whether you have 20" or 28" wheels.