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2013-14 Shelby GT500
Another option now for tires
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<blockquote data-quote="Cman01" data-source="post: 15629648" data-attributes="member: 138028"><p>There's not a huge difference between A and AA and this rating is tested as wet traction not dry.</p><p></p><p>From TireRack's site:</p><p></p><p><span style="font-size: 15px"><strong>"Traction Grades</strong></span></p><p>UTQG Traction Grades are based on the tire's straight line wet coefficient of traction as the tire skids across the specified test surfaces. The UTQG traction test does not evaluate dry braking, dry cornering, wet cornering, or high speed hydroplaning resistance.</p><p></p><p>The Traction Grade is determined by installing properly inflated test tires on the instrumented axle of a "skid trailer." The skid trailer is pulled behind a truck at a constant 40 mph over wet asphalt and wet concrete test surfaces. Its brakes are momentarily locked and the axle sensors measure the tire's coefficient of friction (braking g forces) as it slides. Since this test evaluates a sliding tire at a constant 40 mph, it places more emphasis on the tire's tread compound and less emphasis on its tread design.</p><p></p><p>In 1997, the UTQG Traction Grades were revised to provide a new category of AA for the highest performing tires in addition to the earlier A, B and C grades. Previously the A grade had been the highest available and was awarded to tires that offered wet coefficients of traction above 0.47 g on asphalt and 0.35 g on concrete. Today the grades and their traction coefficients are as follows:</p><p></p><p><strong>Traction As<strong>phalt <strong>Concrete</strong></strong></strong></p><p> <strong><strong>Grades</strong> <strong>g-Force <strong>g-Force</strong></strong></strong></p><p><strong></strong></p><p>AA Above 0.54 0.38</p><p>A Above 0.47 0.35</p><p>B Above 0.38 0.26</p><p>C Less Than 0.38 0.26</p><p></p><p>Unfortunately the immediate value of this change to tire buyers will be limited. Use of the AA grade will first be seen on new tires that are introduced after the standard was enacted and will then appear later on tires that have had the required wet traction all along, but were introduced when the single A was the highest available grade."</p><p></p><p>The difference is minor but the price difference between this tire and MPSS in the same tire sizes is huge.</p></blockquote><p></p>
[QUOTE="Cman01, post: 15629648, member: 138028"] There's not a huge difference between A and AA and this rating is tested as wet traction not dry. From TireRack's site: [SIZE=4][B]"Traction Grades[/B][/SIZE] UTQG Traction Grades are based on the tire's straight line wet coefficient of traction as the tire skids across the specified test surfaces. The UTQG traction test does not evaluate dry braking, dry cornering, wet cornering, or high speed hydroplaning resistance. The Traction Grade is determined by installing properly inflated test tires on the instrumented axle of a "skid trailer." The skid trailer is pulled behind a truck at a constant 40 mph over wet asphalt and wet concrete test surfaces. Its brakes are momentarily locked and the axle sensors measure the tire's coefficient of friction (braking g forces) as it slides. Since this test evaluates a sliding tire at a constant 40 mph, it places more emphasis on the tire's tread compound and less emphasis on its tread design. In 1997, the UTQG Traction Grades were revised to provide a new category of AA for the highest performing tires in addition to the earlier A, B and C grades. Previously the A grade had been the highest available and was awarded to tires that offered wet coefficients of traction above 0.47 g on asphalt and 0.35 g on concrete. Today the grades and their traction coefficients are as follows: [B]Traction As[B]phalt [B]Concrete[/B][/B] [B]Grades[/B] [B]g-Force [B]g-Force[/B][/B] [/B] AA Above 0.54 0.38 A Above 0.47 0.35 B Above 0.38 0.26 C Less Than 0.38 0.26 Unfortunately the immediate value of this change to tire buyers will be limited. Use of the AA grade will first be seen on new tires that are introduced after the standard was enacted and will then appear later on tires that have had the required wet traction all along, but were introduced when the single A was the highest available grade." The difference is minor but the price difference between this tire and MPSS in the same tire sizes is huge. [/QUOTE]
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Another option now for tires
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