[yotatechie04]

They highly recommend that you don't go any higher than 17-inch rims with a 7-inch width at the most. If you want to actually drive the car, than go for the 17s. If you just want to sit it somewhere and show it off without turning the wheel, go for higher size. 17s look rather good on the Gen4s, and they're much safer to have since there's not any modification required. There is just way too much work involved to get a bigger tire size in that well than a 17.