Load Index and Speed Rating
* ONE POUND IS EQUAL TO 0.4536 kg.
The load index is an assigned number that corresponds with the load-carring capacity of a tire. Most passenger car tire load indexes range from 75 to 100 but a few carry more.
| LOAD INDEX & LOAD IN LBS. |
| LOADINDEX |
LOAD(lbs.)* |
LOADINDEX |
LOAD(lbs.)* |
| 65 |
639 |
85 |
1135 |
| 66 |
661 |
86 |
1168 |
| 67 |
677 |
87 |
1201 |
| 68 |
694 |
88 |
1235 |
| 69 |
716 |
89 |
1279 |
| 70 |
739 |
90 |
1323 |
| 71 |
761 |
91 |
1356 |
| 72 |
783 |
92 |
1389 |
| 73 |
805 |
93 |
1433 |
| 74 |
827 |
94 |
1477 |
| 75 |
852 |
95 |
1521 |
| 76 |
882 |
96 |
1565 |
| 77 |
908 |
97 |
1609 |
| 78 |
937 |
98 |
1653 |
| Rating |
Maximum Speed |
| Q |
99 mph |
| S |
112 mph |
| T |
118 mph |
| U |
124 mph |
| H |
130 mph |
| V |
Above 130 mph (without service description) |
| V |
149 mph (with service description) |
| Z |
Above 149 mph |
When "ZR" appears in the size designation with the service description, the maximum speed is as indicated
by the service description.
Examples:
| Tire Designation |
Max. Speed |
| P275/40ZR17 93W |
270 km/h (168 mph) |
| P275/40ZR17 93Y |
300 km/h (186 mph) |
For tires having a maximum speed capability above 240 km/h (149 mph), a "ZR" may appear in the size designation. For tires having a maximum speed capability above 300 kh/h (186 mph), a "ZR" must appear in the size designation. Consult the tire manufacturer for maximum speed when there is no service description.
| Speed Symbol |
Speed (km/h) |
Speed (mph) |
| V* |
Above 110 |
Above 130 |
| V |
240 |
149 |
| W |
270 |
168 |
| Y |
300 |
186 |
*For unlimited V Tires without Service Description, the speed category is over 210 km/h (130 mph)
* ONE POUND IS EQUAL TO 0.4536 kg.
The load index is an assigned number that corresponds with the load-carring capacity of a tire. Most passenger car tire load indexes range from 75 to 100 but a few carry more.
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