NT421Q

About the Nitto NT421Q

All-Season Passenger SUV/CUV tire.

Features

* Intelligent Maintenance Indicators* Nitto's evolutionary 3D multiwave and 3D Interlocking sipe design* Circumferential rubber shoulder inserts* Larger tread blocks on the exterior of the tire* Three wide and deep circumferential grooves* Inside tread area design with large open grooves and high sipe density* Combination of all season rubber compound, advanced siping technologies and water evacuating circumferential grooves* 75,000 Mile Limited Treadwear Warranty (H/V-Rated)* 60,000 Mile Limited Treadwear Warranty (W-Rated)

Benefits

* Visually show how tires are wearing to alert driver to wear issues before they become big problems* Provide traction without sacrificing handling* Adds an additional layer of strength to help navigate potholes and other adverse road conditions* Provide tread block stability to help safely navigate corners* Improve water evacuation, providing increased wet handling and traction* For wet and winter weather performance* For confidence in all weather conditions, even in light snow

Understanding the 235/55R18 XL size

In the size code 235/55R18, 235 is the section width in millimetres (about 9.3"). 55 is the aspect ratio — the sidewall height is 55% of the width, or roughly 129.3 mm. R18 means radial construction on a 18-inch wheel, giving an approximate overall diameter of 28.2".

The load index 104 means each tire supports up to 1,984 lbs — about 7,936 lbs across a full set of four. The speed symbol V certifies the tire to 149 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 640 A A. The treadwear grade of 640 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 A reflects heat resistance at sustained speed (A is highest).

Price and value

At $141.00 per tire, a full set of four costs $564.00. That is about 11% below the average price of the 147 tires we stock in this size. Backed by a 75,000-mile treadwear warranty, that works out to roughly $7.52 per 1,000 miles across the set.