MICHELIN WildRockR Advanced tires are available in two tubeless sizes, and are recommended for racing. They feature MICHELIN Dual Compound and tubeless MICHELIN Gumwall technologies to help enhance performance, puncture resistance and an airtight tubeless seal. Michelin WildRock'R tires are designed for extreme conditions, whether of rock or mud. The central groove helps with directional control while the massive knobs across the width of the tread help withstand the roughest rocky terrain. Its aggressive clawshaped shoulder knobs help you hold your line in extreme cornering situations.