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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.