Tioga Psycho Genius Folding Tire, 29x2.25-Inch High energy- A harder durometer compound (7a) designed to offer better tread wear, mixed with proprietary ingredients that increases surface friction by up to 15% compared to conventional 7a durometer rubber MOTION36 - Special compound formulated to provide neutral reaction with the surface which allows specially designed knobs to have more freedom of movement Synergy dual compound-MOTION36 in the center; High Energy on the sides