I want to ask your opinions on crank arm length. I currently ride 170 on an old Fuji road frame and I poop my pants a little when I have to corner sharply, and a lot when I feel those pedals scrape . (No worries, I got those young jean diapers, skinny fit) I am getting a track frame and can't decide on crank arm length. I want to get as far away from that horrible feeling as possible, and the frame will alleviate a good portion of that, but I'm on the fence at the moment. Is there an extreme difference between the two lengths noticed when riding?