Firehawk Indy 500

About the Firestone Firehawk Indy 500

Summer Ultra-High Performance Passenger Car tire.

Features

* Proprietary pulse groove technology* Improved wet rubber compound and tread design* New tread compound and wide shoulder blocks* Gold Pledge Limited Warranty* 90-Day Buy and Try Guarantee

Benefits

* Improves water evacuation and increases resistance to hydroplaning* Provides 20% shorter stopping distance on wet roads* Improve cornering and handling in dry conditions

Understanding the 275/40R18 size

In the size code 275/40R18, 275 is the section width in millimetres (about 10.8"). 40 is the aspect ratio — the sidewall height is 40% of the width, or roughly 110 mm. R18 means radial construction on a 18-inch wheel, giving an approximate overall diameter of 26.7".

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 W certifies the tire to 168 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 340 A A. The treadwear grade of 340 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 $185.24 per tire, a full set of four costs $740.96. That is about 23% below the average price of the 51 tires we stock in this size.