im gonna go out on a limb and say his back ones are at least 315's because even his fronts look massive.
if you are posting this because you are concerned with fitment... you can fit a 315-35-17 on the rear axle of your car. i would do a little bit of measuring beforehand, though, because mine rubbed a little bit and it kinda bothered me so i took my quad shocks off and inverted them... lol
you should be ok though. before you buy a set post them up on here with dimensions like backspacing and all that and we'll let you know if they will be a problem. good luck |