315/40ZR21 Hankook Dynapro Evo As Ra21 115YFrom morning commutes to long weekends, the 315 40ZR21 Hankook Dynapro Evo As Ra21 115Y is built to make every mile count. With Hankook's expertise, the DYNAPRO EVO AS RA21 delivers predictable control and confident braking. Its Blackwall sidewall adds a clean look while helping protect against bumps and scrapes from daily use. An adaptive tread geometry helps evacuate water, stabilize cornering forces, and support braking when conditions shift.