Wayne Cook
December 1, 2009
Photos By: The Manufacturer

LoadCapacity
Indexin Pounds
71761
72783
73805
74827
75853
76882
77908
78937
79963
80992
811,019
821,047
831,074
841,102
851,135
861,168
871,201
881,235
891,279
901,323
911,356
921,389
931,433
941,477
951,521
961,565
971,609
981,653
991,709
1001,764
1011,819
1021,874
1031,923
1041,984
1052,039
1062,094
1072,149
1082,205
1092,271
1102,337

Speed Rating
The second half of the service description is known as the speed rating. Devised to give the buyer an awareness of the tire capability for safe operating speed, it's the W in our 98W service description. As you can see the tires on our new Mustang are rated safe to 168 mph. Three of the most common speed ratings are S, H, and V. The complete speed-rating table is as follows.

Speed
RatingMax MPH
M81
N87
P93
Q99
R106
S112
T118
U124
H130
V (VR)149
W (ZR)168
Y (ZR)186
* Temporary spare

From our service description we know that a set of our P235/55/R17 98W tires will carry a total load of 6,612 pounds at up to 168 mph safely. You should note that the speed rating doesn't apply to tires that are worn out, repaired, damaged, retreaded, or not properly inflated. Make sure your installation technician has paid attention to any unidirectional marking on the sidewall as required.

The uniform tire quality grading, or UTQG is another important source of information on the sidewall of the tire. In the UTOG, three graded categories include the areas of tread wear, traction, and temperature.