Yes. Motorcycles are like that. Nearly every motorcycle is physically capable of going faster than the rider is comfortable doing. It's very hard to do that on a bicycle, except perhaps for offroad downhill type rides. On my usual road (bicycling) loop, there's one corner where I actually have to control my speed to feel safe, but even there I could probably take it a good 20% faster than I do. (It's a slightly bumpy, banked right turn @ an intersection at the bottom of a steep hill) So, for 15 seconds out of a 1.5 hour ride, I'm limited by something other than muscle power.