Provided you wish to cause persuaded the tires you bought are the ones they place on your motorcar, or whether you're equal curious approximately all those letters and numbers on the sidewall of your tires, it's apparent to announce them. All tires are required by regulation to bear these markings. Taken stable, these markings Testament divulge you, among other matters, the vastness of the tire, how hefty of a load the tires can safely bear, and still deliver you an notice of how quickly the tires Testament wear gone under average practice.
Instructions
1. Bargain the comprehensive raised lettering on the sidewall of your tire. It is normally located near the manufacturer's alias. There Testament be a correspondence followed by a series of numbers. This is the decree for your tire type. For this we Testament adoption the contingency: P215/65 R15 89H.
2. Finish tire type. The packages enactment is what defines the Correct operate of the tire. Tires for passenger cars launch with the packages "P." An "LT" designates the tire is for a illumination Motor lorry. A "T" indicates that the tire is a impermanent spare. An "ST" indicates that the tire is for a trailer such as for a boat or generic hauling trailer.
3. Decide tire broadness. The adjoining locate of digits, up to the "/" term the broadness of the tire. This is the measurement in millimetres of the tire's span from sidewall to sidewall. Our example tire has a broadness of 215 millimetres.
4. Finish angle ratio. The digit now next the "/" is the heighth of the tire's cross shorten as a ratio of its span. The "B" stands for bias construction, meaning the layers of material run diagonally across the tire.6. Determine wheel diameter.
Our process tire bears the character 65, it mode that the heighth of the tire's sidewall is Identical to 65 percent of its breadth.5. Determine construction method. Next you will find either the letter "R" or the letter "B." The "R" stands for radial construction, meaning the layers of material run across the tire's radius.
The number immediately following the construction method designates the diameter of the wheel in inches from end to end. Our example tire is 15 inches in diameter.
7. Determine load index. The number following the blank space after the wheel diameter is the load index, which is a code that indicates the maximum load in pounds the tire can support when it is inflated properly. Our example tire has a load index of 89, which indicates that it can carry a maximum load of 1,279 pounds. The higher the load index number, the greater number of pounds the tire can safely carry.
8. Determine speed rating. This letter corresponds to the maximum speed the tire is capable of according to the following: Q = 99 mph; S = 112 mph; T = 118 mph; U = 124 mph; H = 130 mph; V = above 130 mph. The maximum safe speed for our example tire is 130 mph. This is not a recommendation to exceed posted speed limits.
9. Determine DOT (Department of Transportation) compliance. A smaller "DOT" followed by the tire's serial or identification number -- up to 12 digits -- indicates that the tire complies with applicable DOT standards.
10. Determine UTQG (uniform tire quality grading system) rating. A tread wear rating of 100 is the baseline. Tires designated with a tread wear rating over 100 are better than average, tires with tread wear rating below 100 are poorer than average. For instance, a tire with a 200 tread wear rating would wear twice as long as one rated 100. These grades are only valid for comparing different tires from the same manufacturer and are not valid for comparing tires between different manufacturers.
Traction grades indicate the ability of the tire to stop on wet pavement as measured under controlled conditions. A is rated best, B is rated intermediate and C is rated acceptable.
Temperature grades indicate how the tire resists heat generated by friction when tested under controlled conditions. This is a measurement of the tire's resistance to deterioration under sustained high temperatures. A is rated best, B is rated intermediate and C is rated acceptable.
