About Maxxis Minion-DHF 26 Tire: Ramped knobs for low rolling resistance, fore-to-aft channel cut knobs for straight line control, large block side knobs for cornering. 3C triple compound 70/42/40 durometer tire for downhill use. ST-42: Super Tacky 42 durometer for adhesion in all conditions. For race use only (wears quickly). MP-60: MaxxPro 60 durometer for optimized durability and traction. Silkworm punture protection center strip and LUST (on UST tires only). DH models have a tough 2-ply casing and butyl sidewall reinforcement.