I wonder if they have different windings available. The one in the spec sheet would reach ~36 mph @ 48V with a 26" wheel, ~28 mph with a 20" wheel. This is good for a street legal setup, but if one wants to go faster, they'll need to run a higher voltage pack. If one could get away with running 96V, it would be ideal for a velomobile, and probably make 3-5 kW peak power.