Tire - Enduro Xtrem - Rear - 140/80-18 - 70M Knobs designed specifically for rough terrain to ensure optimum grip even at low speeds, Extremely pliable tread rubber compound derived from legendary Michelin? Trials tire, Outstanding performance on a wide range of challenging surfaces, Proven performance for hard/extreme enduro competitions, M-rated for speeds up to 81 mph, Adaptive tread pattern