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Untitled Document

Wheel & Tire Education

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Untitled Document
 
How To Read Your Tire

 
Tire Math

Lets take the example picture from above. The tire size is 225/65/15. The first number 225 is the width of the tire in Millimeters. The second number 65 represents the sidewall and is a percentage of the first number 225. The last number 15 is the inner diameter measured in inches.

How do I find out how tall the side wall is?

225 (frist number) * .65 (second number) / 2 gives you the sidewall height from the outside of the wheel to the outside of the tire. To convert inches you need to divide answer by 25.4.

 
Speed Ratings

M 81 mph
Q 99 mph
R 106 mph
S 112 mph
T 118 mph
U 124 mph
H 130 mph
V 149 mph
W 168 mph
Y 186 mph+

*Z Rating Breakdown*

P295/35ZR19 max speed > 149 mph
*consult tire manufacturer for exact speed.*
P295/35ZR19 93W max mph = 168 mph
P295/35ZR19 93Y max mph 186 mph
P295/35ZR19 (93Y) max mph 186 +
*consult tire manufacture for exact speed.*

 
Load Ratings
 

Load index is a number ranging from 0 to 270 that references with the load carrying capacity of a tire. Most passenger car tire load index range from 75 to 105. The higher the load index number the more load carrying capacity they have.

Using the example picture above, tire size 225/65R16 89H, the load index of 89 corresponds to a load carrying capacity of 1279 lbs. The H is a reference to the speed rating. As you can see in the above speed rating chart H is speed rated up to 130mph.

 

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