Peak Mountain biking’s speed demon. Description When it’s time to drop the hammer and crush some climbs, Peak is mountain biking’s speed demon. A round profile, closely-spaced tread, and supple casing contribute to Peak’s low rolling resistance, while ample traction and braking performance are delivered thanks to siping on every knob and its multi-dimensional Dynamic:A/T compound. Acronyms Explained Premium = Balanced Weight and Durable Casing Fabric Ultimate = Lightweight Casing Fabric TC = Tubeless Complete Dynamic:A/T = All-Terrain compound providing excellent rolling efficiency while maintaining a high level grip to minimize power transfer loss.