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. | |||
LOAD |
LOAD |
LOAD |
LOAD |
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 |
* ONE POUND IS EQUAL TO 0.4536 kg.
Rating |
Maximum Speed |
Q |
99 mph |
S |
112 mph |
T |
118 mph |
U |
124 mph |
H |
130 mph |
V |
Above 130 mph |
V |
149 mph |
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 |
168 mph |
P275/40ZR17 93Y |
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.