Speed Ratings
Speed ratings tells us what the safe top
speed of a tire under perfect conditions is.
Common speed ratings are:
| Q=99 MPH, 160km/h |
H=130 MPH, 210km/h |
| R=105 MPH, 170km/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 |
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Load Ratings
Many tires come with a service description added
on the end of the tire size. These service descriptions contain a number,
which is the load index, and a letter which indicates the speed rating.
The load index represents the maximum load each tire is designed to support.
Because the maximum tire load capacity is branded on the tire's sidewall,
the load index is used as a quick reference.
| Load Index |
Pounds |
Kilograms |
|
Load Index |
Pounds |
Kilograms |
| 71 |
761 |
345 |
|
91 |
1356 |
615 |
| 72 |
783 |
355 |
|
92 |
1389 |
630 |
| 73 |
805 |
365 |
|
93 |
1433 |
650 |
| 74 |
827 |
375 |
|
94 |
1477 |
670 |
| 75 |
853 |
387 |
|
95 |
1521 |
690 |
| 76 |
882 |
400 |
|
96 |
1565 |
710 |
| 77 |
908 |
412 |
|
97 |
1609 |
730 |
| 78 |
937 |
425 |
|
98 |
1653 |
750 |
| 79 |
963 |
437 |
|
99 |
1709 |
775 |
| 80 |
992 |
450 |
|
100 |
1764 |
800 |
| 81 |
1019 |
462 |
|
101 |
1819 |
825 |
| 82 |
1047 |
475 |
|
102 |
1874 |
850 |
| 83 |
1074 |
487 |
|
103 |
1929 |
875 |
| 84 |
1102 |
500 |
|
104 |
1984 |
900 |
| 85 |
1135 |
515 |
|
105 |
2039 |
925 |
| 86 |
1168 |
530 |
|
106 |
2094 |
950 |
| 87 |
1201 |
545 |
|
107 |
2149 |
975 |
| 88 |
1235 |
560 |
|
108 |
2205 |
1000 |
| 89 |
1279 |
580 |
|
109 |
2271 |
1030 |
| 90 |
1323 |
600 |
|
110 |
2337 |
1060 |
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