NITTO Ridge Grappler A/T Tire (37" - 37x12.50R18)Find parts that fit my vehicle

Anywhere, All the Time. No mountain too high or river too deep when you have the Nitto Ridge Grappler All-Terrain Tire installed on your truck. Rocks or mud can't stop you with the Ridge Grappler's hybrid terrain design that lets you come and conquer everything in your way.

Special Meta-Terrain Lining. The NITTO Ridge Grappler All-Terrain Tire is etched with special meta-terrain lining that propels rocks and rubble, adds extra tire grip, and reduces wearing from textured roads.

Staggered Grip. The NITTO Ridge Grappler All-Terrain Tire's textured rubber has enough grip-retention to allow you to climb steep mountains or slippery trails without skidding or sinking.

Damage Absorbing Construction. the meta-terrain lining of the NITTO Ridge Grappler All-Terrain Tire is also backed by stone ejector grooves and reinforced block foundation from within that stops stone drilling and mud accumulation before it could even start.

Warranty. the NITTO Ridge Grappler All-Terrain Tire comes with an item-limited 5-year Warranty and a 10-Year Service Warranty.

Installation. professional installation is not required, this product can be attached in less than an hour.

Application. The NITTO Ridge Grappler All-Terrain Tire is specified for mud-terrain or all-terrain vehicles.

What is the best gear ratio to run for larger tires? When you increase the diameter of your tires, your vehicle's engine has to work harder to turn them. Naturally, this will lead to increased fuel consumption and reduced performance. So, when upgrading to a set of larger tires you should re-gear your rig to regain this lost acceleration, performance and fuel economy.

Find your original tire size and gear ratio using the chart listed below, the intersection should be your approximate RPMs at 65 MPH. Then find your new tire size and follow it across to the closest RPM to your original tires, this will be your gear ratio choice.

This chart is based on driving at 65 MPH with a 1:1 gear ratio and a manual transmission in 4th gear. Please note if your vehicle is equipped with an automatic transmission your RPMs will be higher due to normal transmission and the torque converter slippage. In overdrive your RPMs will be approximately 15% to 30% less than indicated.

CA Residents: WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov