Cooper Discoverer H/T Plus All-Season Tire - 255/55R18 109T Tire only Optimized pitch sequence by size which reduces noise frequency, allowing a quiet ride. Rim protector decreases the chance of rim damage that can occur if a tire / wheel assembly scuffs a curb. Slightly rounded mold profile balances wet traction and long tread life. All-weather tread provide excellent all-weather performance.