An ideal choice for loose track surfaces, with wider-spaced split knobs for better bite and clean-out. Rear MXR6 uses a new reinforced carcass for 2006; minimizes stretching while maintaining a flat profile, providing consistent feel and performance. New carcass allows lower tire pressures, enhancing control as well as ride comfort. Front MXR6 features a new, longer-wearing tread compound-more motos per tire! Unique 19-inch Holeshot MXR4 returns for 2006, still a great rear tire choice for extremely sandy or rough tracks. MXR4 Rear: 19x10-9, 19x10-10 (2-ply). MXR6 Front: 19x6-10, 20x6-10 (2-ply); Rear: 18x10-8, 18x10-9 (2-ply).