Weathergrip

About the Firestone Weathergrip

All-Weather Passenger Car, Minivan and CUV Touring tire.

Features

* Open shoulder slots* 3D full-depth sipes on all ribs* Pierces water to help reduce the risk of hydroplaning* Rounded footprint* Snow Traction Claw Technology on center and shoulder blocks, with snow vices on intermediate ribs* Carries the Three-Peak Mountain Snowflake (3PMSF) symbol* 65,000 mile/105,000 kilometer Limited Warranty* 90-Day Buy and Try Guarantee

Benefits

* For enhanced water evacuation* For even wear throughout the tire's limited mileage warranty period and for enhanced snow traction* For enhanced snow and wet performance* Meets the required performance criteria for Use in Severe Snow Conditions

Understanding the 235/55R18 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 100 means each tire supports up to 1,764 lbs — about 7,056 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.

What the Firestone Weathergrip is built for

It carries the three-peak mountain snowflake (3PMSF) symbol, meaning it passed a standardised severe-snow traction test. Fitment category: Undefined.

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 $164.24 per tire, a full set of four costs $656.96. That sits close to the average for the 147 tires we stock in this size. Backed by a 65,000-mile treadwear warranty, that works out to roughly $10.11 per 1,000 miles across the set.