Hillbilly Grid Trail 2BR TireThis Hillbilly MTB tire likes it raw. Gravity focused, excelling in steep, slippery, loose, and wet conditions in the continental north, the all new Hillbilly is designed specifically to find traction in shifty natural terrain and bring confidence and control to the unpredictable wild. The new mountain bike tire tread pattern features an aggressive tread with deep center knobs and high volume shoulder blocks to bite through loose soil when cornering.