The Michelin Pilot Sport 4S tire comes in 255/40ZR18. It has a Load Index of 99 which means the tire is rated to hold up to 1709 lbs. The tire has a Speed Rating of Y so it is rated to go up to 186 mph. The UTQG rating is 300AAA. UTQG is a system of ratings that measures the Treadwear, Traction, and Temperature of the tire.
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