650B/27.5-Inch

Specialized's 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 its 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 - 650b x 2.0"; psi 35-65; approximate weight 960g - 29 x 2.0"; psi 35-65; approximate weight 1000g

With soft rubber compounds that stick to wet roots and rocks and well-spaced knobs that allow the tire to clean well, this mud-munching tire is made for riders who won't shy away from an environmental challenge--delivering traction in sections that most riders won't consider hiking over! - Casing: 60 TPI, Dual Ply - Bead: wire - Compound: Base 70a / Top 42a - Pinch Protection: Butyl Inserts at bead - 650b x 2.3, psi 25-50, approximate weight 1160g