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Many Eagle radials are available in speed rated versions to match the speed capabilities of the world's fastest cars. Generally, it is recommended that a speed rated tire be replaced with a tire having an equivalent or greater speed rating.

However, if you never drive at speeds near the limits of your speed rated tires, you may choose to replace them with tires having a lesser top speed rating.

In situations where tires having different top speed ratings are mixed on a vehicle, the maximum speed certification is limited to the top speed certification of the tire with the lowest speed rating.

Speed ratings do not indicate how well a tire handles or corners. They only certify a tire's ability to withstand high speed.

Speed ratings are indicated as follows:

Q   99 MPH/160 KPH
S   112 MPH/180 KPH
T   118 MPH/190 KPH
U   124 MPH/200 KPH
H   130 MPH/210 KPH
V (w/o service description)   Above 130 MPH/210 KPH
V (with service description)   Above 149 MPH/240 KPH
W   168 MPH/280 KPH
Y   186 MPH/310 KPH
Z   Above 186 MPH/310 KPH

The speed rating is described on the tire sidewall. Many tire manufacturers currently include the speed symbol in the tire size description.

Example:   P225/70HR15      Speed Symbol

In this example the H indicates that the tire is capable of sustained speeds up to 130 MPH.

Some tire manufacturers have recently removed the speed symbol from the size description. Instead, the speed symbol appears along with a European Load Index directly following the size description. These markings are called the tire service description.

Example:   P22570R15100H    Load Speed Index Symbol

In this example, the tire is certified for sustained speeds up to 130 MPH, but only when it is loaded at a level equal to or less than the specific maximum load which corresponds to the 100 Load Index.

On P-Metric sized tires manufactured in the United States, the Load Index number corresponds to the maximum load capacity embossed on the lower tire sidewall. In Europe, maximum tire loads are listed in a load index table. (Load index 100 = 795 KG for our example tire).

In 1991, a formal and global speed rating standard will be in place. This standard will require a service description marking on all speed rated tires up to, and including, H-rated constructions. Tires certified for V speed ratings may continue to be marked in several different ways, each of which has a different meaning.

Example: P225/70VR15

This tire would be certified for speeds above 130 MPH because the speed symbol appears only in the size description.

Example: P225/70R15 100V

This inclusion of a trailing service description (100V) indicates that the tire is certified for speeds up to 149 MPH.

Example: P225/70VR15 100V

If the V appears in both the size and service description, the service description overrules and the tire is certified up to 149 MPH.

Example: P225/7ZR15

Tires certified for Z speed ratings (top speeds over 149 MPH) will continue to be identified by including the speed symbol in the size designation since the top speed for a Z rated tire is determined in accordance with the manufacturer's vehicle specifications.

To ensure high performance in tires used for public safety applications, many government agencies have designed purchase specifications which tire manufacturers must meet or exceed. Some agencies, however, may not have the resources to design their own specifications. In these cases, Goodyear can be of special help. We can provide you with specification guidelines, including size and physical dimensions, carcass strength, treadwear tests and high speed tests as standards to be used in government agency purchasing. We also can assist you in writing your own specifications.

For any information or assistance you need, please write or call The Goodyear Tire & Rubber Company, Government Sales & Marketing, Akron, Ohio 44316-0001 D/709. Phone (330) 796-4352.