stock crossfire size is front 225/40-18,, 8.9 side wall,,3.6 side height and 25.1 tall
and the rear is -------------255/35-19,,, 10.0 " ,,,,,,,, 3.5 ,,,, " ,,,,,,,,,,,, 26.0 tall
in th front i say stay the same
in the rear you can use 265/35-19 10.4,,3.7,,26.3 tall
--------------------------- 295/30-19 11.6,,3.5,,26 tall


jim