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