The Federal Evoluzion ST-1 tire is the latest UHP summer tire built for the ultimate driving experience on sports cars or luxury performance sedans. This tire delivers precise response to steering inputs, and exceptional traction on wet and dry roads. The Federal Evoluzion ST-1 tire has rows of circumferential blocks with entirely straight grooves. These linear grooves provide good on-center feel for high performance driving, as well as clear channels for water to evacuate from under the tire on wet roads. For precision handling the tire has improved sidewall rigidity. Also, new rubber compounds improve wet traction, vehicle control and gives longer tread-life.