The Michelin Pilot Sport A/S 4 245/45zr21xl is a high performance all-season tire designed for luxury cars and sport sedans. It features a unique tread pattern that offers superior wet and dry traction, as well as improved cornering and braking. The tire also offers a comfortable ride and low noise levels. It is rated for speeds up to 149 mph and has a UTQG rating of 400 AA A.