Champiro UHP AS

About the GT Radial Champiro UHP AS

All-Season Ultra-High Performance Passenger Car tire.

Features

* Directional tread design* Four wide circumferential grooves* Multi-depth sipes* Advanced nanometer silica compound* V-Shaped directional grooves and sipes* Optimized variable pitch technology* Large shoulder blocks and center rib design* Rim protector* 45,000 Mile/75,000 km Limited Treadwear Warranty (Half stated mileage warranty for rear of split fitment)* 30 Day/500 Mile Test Drive Satisfaction Guarantee* Road Hazard Warranty

Benefits

* Reduce hydroplaning for improved wet performance* Enhance wet grip and all season performance throughout the life of the tire* Improves wet grip and reduces rolling resistance for increased fuel efficiency* Improve water evacuation efficiency and maximize grip* Provide increased rigidity for precise handling, straight line stability and crisp steering response* Protects wheels from curb damage

Understanding the 255/45ZR18 size

In the size code 255/45R18, 255 is the section width in millimetres (about 10"). 45 is the aspect ratio — the sidewall height is 45% of the width, or roughly 114.8 mm. R18 means radial construction on a 18-inch wheel, giving an approximate overall diameter of 27".

The load index 99 means each tire supports up to 1,709 lbs — about 6,836 lbs across a full set of four. The speed symbol Y certifies the tire to 186 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 A. 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 A reflects heat resistance at sustained speed (A is highest).

Price and value

At $113.24 per tire, a full set of four costs $452.96. That is about 35% below the average price of the 43 tires we stock in this size. Backed by a 45,000-mile treadwear warranty, that works out to roughly $10.07 per 1,000 miles across the set.