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"Let me explain the speed ratings, though. Remember HR, SR, TR, VR, and ZR? Respectively, the tire is good up to 110, 115, 125, 149, and 150+ for long sustained speeds. If there is just an "R" then 105 is the sustained limit for safety at that speed. The higher speed rating will also bring increased ride harshness, as the tires have to be built to withstand the speeds for which they are capable." - http://www.midsouthvw.com/TechTips/tech_tip_tires.htm

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15y ago
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Q: What does SR mean on the side of tires?
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