Tire sizes are usually listed
in 3 numbers, for example:
245/55/18
The first number is the width of the tire in
mm, so in this case it is 245mm.
The second number is sidewall height as a
percentage of the width. So with the example, the
sidewall is 55% of the width (245mm) which comes out
to 134.75mm.
The third number is the diameter of the rim
in inches.
So to calculate the diameter of a tire:
(sidewall X 2) + wheel
In this case, the formula would look like this:
Convert the inches to mm, so the wheel is actually
457.2mm
(134.75mm x 2) + 457.2mm = 726.7mm or 28.63 inches.
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Load Index
Code
Pounds
Kilograms
71_____761_____345
72_____783_____355
73_____805_____365
74_____827_____375
75_____853_____387
76_____882_____400
77_____908_____412
78_____937_____425
79_____963_____437
80_____992_____450
81_____1019_____462
82_____1047_____475
83_____1074_____487
84_____1102_____500
85_____1135_____515
86_____1168_____530
87_____1201_____545
88_____1235_____560
89_____1279_____580
90_____1323_____600
91_____1356_____615
92_____1389_____630
93_____1433_____650
94_____1477_____670
95_____1521_____690
96_____1565_____710
97_____1609_____730
98_____1653_____750
99_____1709_____775
100_____1764_____800
101_____1819_____825
102_____1874_____850
103_____1929_____875
104_____1984_____900
105_____2039_____925
106_____2094_____950
107_____2149_____975
108_____2205_____1000
109_____2271_____1030
110_____2337_____1060
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Tire Speed
Rating Chart
Speed Ratings
Q = 99 mph,
160km/h
S = 112 mph,
180km/h
T = 118 mph,
190km/h
U = 124 mph,
200km/h
H = 130 mph,
210km/h
V = 149 mph,
240km/h
W = 168 mph,
270km/h
Y = 186 mph,
300km/h
Z = 149 mph,
240km/h and over
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