What is the tyre size of Porsche Cayenne?

Porsche Cayenne is available in 8 tyre sizes - 255/55 R18, 255/55 R19, Front: 255/55 R 19, Rear: 275/50 R 19, 285/40 R 21, Rear: 315/35 R 21, 275/45 R20, 265/50 R19, Front: 285/35 R22, Rear: 315/30 R22 and 275/45 R20,295/35 R20.