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Cooper tire ratings are governed by the Uniform Tire Quality Grading (UTQG) system developed by US Department of Transportation. This evaluation system helps consumers to compare the quality of tires in and among different tire companies by giving a rating to tires based on a number of factors. Cooper tire ratings and the ratings of other tires are a comparative rating based on government standards. These ratings also provide information on the type of tire that is appropriate for a vehicle.
Cooper tire ratings indicate tire quality based on a number of factors. The UTQG measures tire treadwear traction and temperature. Cooper tire ratings will provide a number that indicates the tire''s wear compared to the government minimum standard for tread and traction. These Cooper tire ratings will take the form of a number. The government standard is a rating of 100. If a tire receives a rating of 300, for example, the tire has been found to wear three times longer than the government minimum standard tire.
Cooper tire ratings also include a letter grade following this number which indicates traction and temperature ratings. The letter “A” is given for superior quality, “B” for good, and “C” for average. The temperature rating is given to the tire as an indication of their tire''s ability to disperse built up heat. When a tire gets overheated the rubber begins to deteriorate, thereby compromising the integrity of the tire.
Cooper tire ratings may also include a speed rating which gives a general maximum speed that the tire can adequately withstand. These Cooper tire ratings are based on laboratory tests done to measure road performance. When Cooper tire ratings lack a specific speed rating, the maximum speed for that tire is considered 85 miles per hour. Most vehicles have a placard on the door frame or glove box that indicates the type of tire (including size and speed rating) that is appropriate for that vehicle.
Though Cooper tire ratings can give a relative indication to the quality of the tire you are purchasing, they are not a guarantee of safety nor do they indicate any possible defects that the tire may possess as a result of design or manufacturing flaws. Cooper tire ratings are not a good indicator of overall road safety, though they do provide a base for comparing tires in and among different tire companies.
Despite adequate Cooper tire ratings, at least 35 people have been killed in the last six years in accidents caused by defective Cooper tires. Tread separation poses one of the greatest threats to vehicle safety in terms of tire functioning. Tread separation leads to total tire blow out which can cause a vehicle to lose control and even rollover. Despite seemingly strong Cooper tire ratings, Cooper Tire and Rubber Company has been subject to numerous lawsuits charging them with negligent manufacturing procedures, including melting foreign objects into their tires, popping blisters in the rubber with a sharp object, concealing the defect and sending the product to market, and tampering with safety inspections. Over fifteen types of Cooper tires have been recalled since 2000. Cooper tire ratings alone may not be a strong indicator of tire quality or safety on the road.
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