YEA I 2ND WHAT BAGGNs10 said, im pretty close with my setup (jasons cups, 255c's, 2" belltech drop spindals), but im not layin upfront, i have xtreme rims with the factory tire size that came on them and im hittin the fenderwells, i dont know if ur factory 15's with those tires are the same as my extreme's.