are they consered with what they do from a stop? they are just after top end and handeling (correct me if i'm wrong) they dont' do 1/4 mile springs if they do on a back stretch or something they do 90-200+ which a 13 or 15 " wheel just won't do the gearing would be too high if they did use a 13'15" wheel the sidewall on the tire would be totally rediculous looking and wouldn't pull through a corner well.