The Specialized Ground Control Control 2 Bliss Mountain Bike Tyre uses Specialized’s new CONTROL casing which delivers plenty of versatility & puncture protection for trail riding. Not only does it feature enhanced cut-resistance, but Specialized have also optimized the tread using Finite Element Analysis. It also features Specialized’s own GRIPTON compound that maximizes mechanical grip, damps vibration, & offers unparalleled traction in either wet or dry conditions. Features· Casing: 60 TPI· Bead: Foldable· Butyl wrapped bead = 2 Bliss Ready· Compound: GRIPTON· 26 x 2.1", psi 25-50, approximate weight 580g· 27.5 x 2.3", psi 25-50, approximate weight 670g· 29 x 2.1", psi 25-50, approximate weight 640g· 29 x 2.3", psi 25-50, approximate weight 740g