With soft rubber compounds that stick to wet roots & rocks & well-spaced knobs that allow the tyre to clean well this mud-munching tyre is made for riders who wont shy away from an environmental challenge--delivering traction in sections that most riders wont 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