The Specialized Hillbilly Grid Trail Mountain Bike Tyre is a perfect option for front tyre use when the course features intermediate to soft terrain. When the soil is changing from hard to soft, the small blocks penetrate the ground surface & better connect you to the trail. Small surface centre knobs also increase the load on the ground & help surface penetration, while the shoulder knob row provides support in fast turns on all surfaces. Specialized’s GRIPTON compound, meanwhile, improves high frequency damping, better attaching the tire to the ground over small bumps & rough sections alike. This also means that the low frequencies of the rolling tyre deflections pass through unfiltered, leaving no energy to be absorbed & keeping your speed high. Specialized’s new GRID TRAIL casing is stiffer, delivering better handling at lower pressures—all while increasing pinch flat protection by 15% & puncture protection by 30%. Features· Casing: Additional bead to bead protection for exceptional durability, plus sidewall stiffness stability.· Bead: Foldable· Butyl wrapped bead = 2 Bliss Ready· Compound: GRIPTON®· 27.5 x 2.3", psi 25-50, approximate weight 830g· 27.5 x 2.6", psi 20-40, approximate weight 850g· 29 x 2.3", psi 25-50, approximate weight 900g· 29 x 2.6", psi 20-40, approximate weight 930g