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The speed rating of any tire is a measurement of the top safe speed the tire can carry a load under specified conditions. It is also an indication of how the tire will handle at lower speeds. A higher rated tire will give you better traction and improved steering response even at 50mph. Below is a listing of common speed ratings: Q = 99 MPH, 160km/h S = 112 MPH, 180km/h T = 118 MPH, 190km/h U = 124 MPH, 200km/h H = 130 MPH, 210km/h V = 149 MPH, 240km/h Z = 149 MPH, 240km/h and over W = 168 MPH, 270km/h Y = 186 MPH, 300km/h Caution: Never mix tires with different speed ratings on your vehicle.
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