listen to 11.4... hes on to something. there are sacrifices you have to make when you ride on the street, what may be the most efficient on the track, is not the most pracitcal when you're dodging traffic. I designed my bike really conservatively to allow myself to be nimble and precise, not to be a speed bomber. im attracted to fixed gear because of the higher level of control, not the speed. I think the 167.5 would be a good compromise and if i could have found the cranks i ride in that length I think thats what I would have gone for.