- Dual Sidewall Designs - Each Grappler has two sidewall designs so you can choose how your tires look. On the Trail Grappler one side has stylized lettering with V-shaped buttresses and the other has traditional lettering with flat buttresses. This feature was an engineering feat since even a small weight imbalance can cause unwanted vibrations. Nitto produces exceptionally uniform off-road tires even with different designs. - Tread Block Arrangement - A common complaint with mud terrain tires is their noise level. Nitto's engineers set out to design an aggressive -- and yet quiet -- off-road tire. Using 3D computer simulation, Nitto's engineers were able to systematically adjust the size, shape and position of the tread blocks. As a result, Nitto produced an off-road tire that is 34% quieter at street speeds and 36% quieter at highway speeds (Compared to Nitto Mud Grappler) - Duability - The 3-ply sidewall with a high turn-up construction acts as an extra layer of reinforcement to increase puncture resistance. - On-Road Comfort - Nitto's proprietary, automated manufacturing system produces extraordinarily uniform tires. This creates a smooth ride on paved roads. - Shoulder Groove - Reinforced shoulder grooves adds additional off-road and all-season performance without compromising tread block stiffness. - Central Siping - Deep center sipes decrease hydroplaning and increases traction in wet conditions. - Mud Evacuation - The balanced void ratio efficiently removes mud and dirt from the tread to provide continuous off-road traction.