Speed ratings are the product of laboratory testing – with simulated speeds and loads. To receive any kind of rating, a tire must demonstrate that it’s capable of sustaining a particular speed. Industry standards govern the process of reaching and maintaining a given speed during a test. Howe...
These cap plies are not found on all tires; they are mostly used on tires with higher speed ratings to help all the components stay in place at high speeds. The tire sidewall provides lateral stability for the tire, protects the body plies and helps keep the air from escaping. It may ...
Why Were Tire Speed Ratings Developed? The speed rating system used today was developed in Europe in response to the need to control the safe performance of tires at standardized speeds. When the rating system was originally developed, the "Unlimited V" category of over 210 km/h (130 mph) ...
Speed Rating The final figure in a tire size code is the speed rating, which is designated by a letter. Like the load index tells you each tire’s maximum carrying capacity, the speed rating signifies the tire’s maximum speed capability. If your tire reads P215/65R15 95H, the “H” ...
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Speed ratings are based on tests in which engineers run the tire at 6.2 mph steps, in 10 minute increments, until the required speed has been met. Tire Sidewall Markings: Explanation of Tire Size Designations: Tire Speed Symbols: Tire Load Index Table – Maximum Load Per Single Wheel: ...
In the example "H", the letter indicates that the tire can safely handle speeds up to 130 mph. When replacing a tire, it is important to choose one with an equivalent or higher speed rating and to make sure all tires on a vehicle have the same speed rating. ...
Tire Speed Ratings Some tires bear a letter "speed rating" designation indicating the tire's design speed capability. This speed rating system is intended to allow you to compare the speed capabilities of tires. When purchasing or replacing speed-rated tires, make sure to: ...
Speed rating The final letter (sometimes more than one) on your car tire’s sidewall indicates the tire speed rating. Similar to the load index, this is a reference code used to look up the actual recommendedtop speedin an index. Tires with higher speed ratings will perform better and prov...
See "Tire Speed Ratings," the next section in this manual. Refer to your vehicle owner's manual for any tire pressure recommendations for high speed driving. TIRE SPEED RATINGS A tire bearing a letter "speed rating" designation indicates the tire's speed capability according to standardized ...