The ones in the front - the black rims you see are 18 by I think 9 However the rears that we are going to run could be up to 18 by 13 with rubber somewhere around 18/35/335 ish that's an easy viper wheel tire combo to run. The TT viper in our stable runs that size - two of those out back in a GN ? Yes like the flinstones, meet the flinstones - yabadado !