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The first two digits (87S) represent the tire's load index and are followed by a single letter (87S) identifying the tire's speed rating. "Using a P195/60R15 87S tire size as our example, the 87S at the end of the size represents the tire's service description. A service description identifies the tire's load index and speed rating." Load Index
Understanding Tire Ratings Tire Speed Ratings and Tire Codes. ... This tire rating is not required by law so may not be listed on your tire. Take a look at the speed rating chart below for all the various codes: * If a tires maximum speed is over 149 mph, the tire manufacturer may use the letters ZR. ...
Tire Rating Lookup To help you in buying tires, NHTSA has rated more than 2,400 tire lines, including most used on passenger cars, minivans, SUVs and light pickup trucks. The Uniform Tire Quality Grading System (UTQGS) lets you compare tire treadwear, traction performance, and temperature resistance.
The ISO Metric tire code consists of a string of letters and numbers ... Some of the older letter-code load-range ratings for Light Truck Tires can be found in a chart published by the Goodyear Tire & Rubber Company. For example: ... In practice a higher load rating tire was also a wider tire. In this system a tire had a letter, optionally ...
Tire load index chart and understanding your tire's code. The service description is simply the speed rating and the load rating together. In our example, the service description is the last three characters: 225/45R17 94H 94 is the load rating and H is the speed rating. But what exactly does that mean…? Tire load rating or load index
Tire Speed Ratings & Tread Life. The most common tire speed ratings, speeds and vehicle usage are as follows: The Origin of Speed Ratings. We can thank Germany’s famous Autobahn for tire speed ratings. Tire speed ratings range from A (the lowest) to Y (the highest). But the chart is not completely in alphabetical order.
Speed Rating Today, the only tires that continue to include the speed rating "in" the tire size (P225/50ZR16) are Z-speed rated tires. In this case, following the two digits used to identify the aspect ratio are the letters ZR to identify the tire's speed rating (Z) and its internal…
Speed Rating V. Once the highest speed rating a tire could have, “V” used to represent a maximum of 149 mph (240 kph) or more. Nowadays, it means 149 mph but no higher. Speed Rating W. A relatively new addition to the speed rating chart, tires with speed rating “W” can achieve a maximum sustained speed of 168 mph (270 kph). Speed Rating Z
Athough we don’t recommend it, if you use a tire with a speed rating lower than your vehicle’s original tires, you will reduce your vehicle’s top speed limit to the tires’ speed rating. The handling of a performance vehicle may be different when the replacement tires are not the same speed rating.