What is the tyre size of Porsche 911?Porsche 911 is available in 6 tyre sizes - 235/40 ZR19, 235/40 ZR 19, 245/35 ZR20, 245/35 ZR 20, F:255/35ZR20,R:315/30ZR21 and F:255/35ZR20,R:315/30Z 21.