when i first started commuting, i was really bummed i couldn't get over 15 mph (huffin' and a puffin'). after a few months (4 or 5), i could sustain 18 mph easy. my lungs and legs had caught up with what i was doing, and all was well. i'm on a fixed gear bike where 90rpm is 19.4mph. pushing hard i'm in the low to mid twenties. if, and i say //if// everything is perfect, i can easily sustain 25+ with a nice tail wind. that's all on flat ground. i max out at around 30mph downhill. 'can't pedal any faster.

i would like to get a road bike with bigger gear selection, to see what i can do.