Schwalbe Rock Razor Addix, 29'x2.35, Folding, Addix Speedgrip, SnakeSkin, 67TPI, 23-50PSI, 740g, Black 11600660.01. Used on very fast and dry trails. Low rolling resistance and minimal weight. Primarily for the use on the rear wheel. Tread design Fast, flat studs in the tread center good cornering grip with sturdy lugs on the tire shoulders. Super Gravity version ADDIX Soft orange . Punctureproof with Apex with extreme lateral stability for a dynamic ride. Tubeless Easy version ADDIX Speedgrip blue . In 27.5 also with Apex. The semi-slick Used on very fast and dry trails. Little rolling resistance and little weight. Primarily for use on rear wheel. fast, flat studs in the center of the tread for good corner grip sturdy lugs on the tire shoulders