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The Science Behind Your Drive

Learn more about important specifications like speed rating and load index.

Once you're ready to start shopping, our tire finder will help you get started.    

Tire Specs

Speed Rating

Tire speed rating tells you the maximum service speed for a tire. A speed rating isn't, however, a recommendation to exceed speed limits, and doesn't indicate how well a tire handles or corners.

Generally, it is recommended that a speed-rated tire be replaced with a tire having an equivalent or greater speed rating. For example, if the recommended speed rating is a V, it's suggested that you replace it with a V, W, Y, or Z.

It is not recommended to fit tires with different speed ratings. If tires with different speed ratings are installed on a vehicle, they should be installed with like pairs on the same axle. The speed capability of the vehicle will become limited to that of the lowest speed rated tires. Obey all speed limits.

Service description speed symbol Maximum speed (MPH) Size speed symbol
Q 99  
R 106  
S 112  
T 118  
U 124  
H 130  
V 149  
  Above 149 ZR
W* 168  
Y* 186 ZR
(Y)** Above 186  

* W- and Y-speed ratings are subcategories of the Z-speed rating.
** Per the TR&A 2007 yearbook, 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 capacity above 300 km/h (186 mph), a ZR must appear in the size designation and a service description, including the Y speed symbol, must be included in brackets.

Load Index

Tire load index is an assigned number that corresponds to the maximum weight that a tire can support when properly inflated. The higher the tire's load index number, the greater its load carrying capacity. Choosing a tire with a lower load index than the original equipment specifications means that the tire will not carry the load capacity of the original.

Most passenger-car tire load indexes range from 75 to 100, but some are higher. The chart shows how load indexes translate to weight.

Load Index Load (lbs)
75 852
76 882
77 908
78 937
79 963
80 992
81 1019
82 1047
83 1074
84 1102
85 1135
86 1168
87 1201
88 1235
Load Index Load (lbs)
89 1279
90 1323
91 1356
92 1389
93 1433
94 1477
95 1521
96 1565
97 1609
98 1653
99 1709
100 1764
101 1819
102 1874
Load Index Load (lbs)
103 1929
104 1984
105 2039
106 2094
107 2149
108 2205
109 2271
110 2337
111 2403
112 2469
113 2535
114 2601
115 2679
116 2756
Load Index Load (lbs)
117 2833
118 2910
119 2998
120 3086


Not all sidewalls are built the same. Check out the different types of sidewall styles that we offer below.


goodyear black sidewall tire

A black sidewall with black lettering.


goodyear whitewall tire

White bands on the sidewall vary in width.

Outlined Letters

goodyear white letter tires

Letters on the sidewall are outlined in white.


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