Traxxas Sledgehammer 2.8" Pre-Mounted Tires with 12mm Hex. The Sledgehammer tire was designed for extreme traction and control in off-road terrain. The Sledgehammer's increased overall diameter provides additional ground clearance, while the open block tread design clears mud and debris for great traction in loose surfaces. Package includes two pre-mounted tires intended for the Traxxas Rustler 4x4, Hoss 4x4 and Stampede 4x4.