> cyclists doing well over 60 inside town narrow streets

I used to cycle and I don't think I could achieve 60 on flat ground like Amsterdam. That's very solid sprinting that even the best cyclists in the world can only achieve for short periods of time. On narrow Amsterdam streets with cobblestone? Impossible...

I'm fast. I've been clocked at over 40. 40 is crazy fast. Most cyclist go 15. The fast ones 20-25. The very fastest maybe 30-35. 60 is a wild exaggeration. That's what sprinters do in the Tour de France.