Speed ratings signify the safe top speed of a tire under perfect conditions. Common speed ratings are:
| Q=99 MPH, 160km/h | V=149 MPH, 240km/h |
| S=112 MPH, 180km/h | W=168 MPH, 270km/h |
| T=118 MPH, 190km/h | Y=186 MPH, 300km/h |
| U=124 MPH, 200km/h | Z=149 MPH, 240km/h and over |
| H=130 MPH, 210km/h |