The Hardrock&';R is a long-lasting tire with an aggressive, yet smooth rolling, tread with multi-directional knobs that are sure to improve traction and cornering over mixed terrain. And with the added benefit of Flak Jacket flat protection, you&';ll be sure to hit it all with confidence and control. Casing: 30 TPI Bead: Wire Compound: 70a Flat Protection: Flak Jacket 26 x 2.0", psi 35-65, approximate weight 880g 27.5 x 2.0", psi 35-65, approximate weight 960g 29 x 2.0", psi 35-65, approximate weight 1000g