The new Azenis RT-615 comes with tons of improved features! Motorsports grade cap compound maintains grip over a wide range of operating temperatures. Increased internal void ratio delivers enhanced wet grip and aquaplane resistance under competition conditions. 8/32nd molded tread depth reduces "squirm" when new while providing predictable mileage for street use. One of the best autocross tires on the market the Azenis RT-615 is built to perform. If you need help picking out a tire, or have a questions about size please contact us at 1-480-966-3040.