For the first time, the Cayenne’s rear tires are wider than its front tires - like a sports car! And they’re bigger than on the previous version, too. The basic Cayenne runs on front 255/55ZR19 tires and rear 275/50ZR19 tires. The Cayenne Turbo has 285/40ZR21 tires in front and 315/35ZR21 tires in back. The test vehicles were fitted with Pirelli P Zero tires. Expect to spend a fortune for these tires, especially for the Turbo, as they may be difficult to find outside the dealerships.