right i have some 17 inch wheels from a 2wd car that are going on a 4wd car,the current tyre sizes are 205/45/17 and 225/45/17 but the rears are 9 inches wide and the fronts are 8 inches wide,and i need to swap either the fronts or the backs so that the rolling radius is the same at both ends so that the centre diff doesnt get worn out quickly,any programs or experts on here that know what i should be getting?cheers.