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.
LOAD INDEX	LOAD (lbs.)*	LOAD INDEX	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)