what are these 'tarck' bikes people keep speaking of? i've never ever struck pedal on my track bike with 170mm arms/keo pedals, though once when i was less experienced and had cages, i did try to evade a speedbump, skidding my pedal on a curb and supermanning over the bars. i wound up skidding across the pavement straight on my chest (with no road rash, thanks louis garneau!)