I'm a bigger guy, between 200-210 for now.. not huge by any means. Mt usual route (one I rode yesterday) is about a 2.5-3mi route that I repeat 3-4 times with two big climbs and the rest mostly flats where I can hit 30-31mph if I push myself hard (large chainring out of service for now). I did a max of 33.5mph on a descent after one of those climbs yesterday.. was kind of scary without a helmet on shoddy pavement with tar patches all over the place! Also, the wind was pretty bad yesterday, not sure on the mph but it really made my ride a pain. 300 sounds about right all things considered.