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Message: <blockquote data-quote="vr2turbo" data-source="post: 1064653310" data-attributes="member: 92229">As bro. ixeo mentioned, it may differ between manufacturers but actually there is a standard but whether they follow is another matter.Standard are as follows: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:Traction Asphalt ConcreteGrades g-Force g-ForceAA Above 0.54 0.38A Above 0.47 0.35B Above 0.38 0.26C Less Than 0.38 0.26</blockquote>

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