Michelin Pilot Sport PS2 ZP Radial Tire - 255/35R18 90Z Tires that meet or exceed the discriminating standards of the biggest names in the ultra-high performance category. Tread design breaks traditional compromises by putting more rubber on the road to facilitate precise cornering and consistent straight-line performance. Unique tread design utilizes both a semislick outer tread and a wet-styled innertread to help deliver high levels of wet and dry performance.