Specialized Hillbilly GRID TRAIL 2Bliss Ready T7 Tyre 29 X 2.6The Hillbilly GRID TRAIL 2Bliss Ready T7 tire has been designed for heavy pedal, hard pack ridingreceiving vertically stepped knob shapes for more knob core stability and additional biting edges. Fast courses on hard packed ground require a light, fast tire center to keep speeds high, but must also keep the speed through loose sandy corners and track well under hard braking. For these reasons, we've kept the high shoulder knobs. Our GRID TRAIL casing