Ridge Grappler

About the Nitto Ridge Grappler

Rugged-Terrain Passenger Light Truck/SUV tire Combining the Extreme Off-Road Traction of a Mud-Terrain tire with the On-Road Traction and Comfort of an All-Terrain tire. Features Dual Sidewall Design.

Features

* Variable pitch tread pattern* Alternating shoulder grooves* Lateral Z grooves* Coupling end points* Reinforced block foundation* Stone ejectors* Staggered shoulder lugs* Alternating tapered edges* Step block edges

Benefits

* Provides a quiet and smooth highway ride* Help clear mud and maintain traction* To provide biting edges for traction* Strengthens the block edge to reduce irregular wear* Adds rigidity to tread blocks to reduce flex* Protects the bottom of groove from stone drilling* Provides traction in off-road environments* Provides additional biting edges for more traction

Understanding the 255/55R18 XL size

In the size code 255/55R18, 255 is the section width in millimetres (about 10"). 55 is the aspect ratio — the sidewall height is 55% of the width, or roughly 140.3 mm. R18 means radial construction on a 18-inch wheel, giving an approximate overall diameter of 29".

The load index 109 means each tire supports up to 2,271 lbs — about 9,084 lbs across a full set of four. The speed symbol T certifies the tire to 118 mph under its rated load. Always match or exceed the load index and speed rating listed on your vehicle's door-jamb placard.

Tread life and grip ratings

This tire carries a UTQG rating of 500 A B. The treadwear grade of 500 is a relative durability score — a grade of 200 is expected to last roughly twice as long as a grade of 100 under the same controlled test. Traction grade A measures straight-line wet stopping grip (AA is highest, then A, B and C). Temperature grade B reflects heat resistance at sustained speed (A is highest).

Price and value

At $226.50 per tire, a full set of four costs $906.00. That is about 20% above the average of the 83 tires we stock in this size, reflecting its position in the range.