My top speed is elusive since our terrain is hilly and we have a lot of wind. The best data I have is from the track last week where I did 32.4 mph from a standing start in 500 meters. I used a 51/15 gear. Since I went around the track, it was flat and wind to an extent canceled out. I was accelerating at the finish so I could probably got up another 10% with that gearing.