Not to sure..?
 

ok heres the deal. i want some wheels but not sure what size.. i was thinking 17 or 18? is there really any differnece.. in performance wise? i heard the bigger the worse? and i would like to put 275/315 on the back of my car.. and possibly 255/275 depending on whats on the back.. but i was wondering how wide of a wheel i would need to acomplish this? can someone help this wheel dumb ass... :)