Cooper Starfire SF340 All-Season Radial Tire - 215/75R15 100S Tire only Modern All-Season Tread Design - This Modern-Looking Radial Will Perform In All Four Seasons. Deep, Lateral Shoulder Slots - Our Design Uses Lateral Slots In The Shoulder To Help Ensure Excellent Traction Throughout The Life Of The Tire. Circumferential Grooves - See-Through Grooves Help Disperse Water And Slush To Provide Dependable All-Season Traction. Offset Shoulder Sipe Technology - Computer-Modeled Geometry Balances Larger Areas For Element Stability With Small Element Flexibility And Biting Edges For All-Weather Performance.