Example 1: 315/80R22.5
The table below lists the appropriate speed rating with the corresponding load index
Example 2: 10.00R20
The table below lists the appropriate speed rating with the corresponding load index
SI | Km/h |
---|---|
B | 50 |
C | 60 |
D | 65 |
E | 70 |
F | 80 |
G | 90 |
J | 100 |
K | 110 |
L | 120 |
M | 130 |
N | 140 |
P | 150 |
Q | 160 |
R | 170 |
LI | kg | LI | kg | LI | kg |
---|---|---|---|---|---|
115 | 1215 | 136 | 2240 | 157 | 4125 |
116 | 1250 | 137 | 2300 | 158 | 4250 |
117 | 1285 | 138 | 2360 | 159 | 4375 |
118 | 1320 | 139 | 2430 | 160 | 4500 |
119 | 1360 | 140 | 2500 | 161 | 4625 |
120 | 1400 | 141 | 2575 | 162 | 4750 |
121 | 1450 | 142 | 2650 | 163 | 4875 |
122 | 1500 | 143 | 2725 | 164 | 5000 |
123 | 1550 | 144 | 2800 | 165 | 5150 |
124 | 1600 | 145 | 2900 | 166 | 5300 |
125 | 1650 | 146 | 3000 | 167 | 5450 |
126 | 1700 | 147 | 3075 | 168 | 5600 |
127 | 1750 | 148 | 3150 | 169 | 5800 |
128 | 1800 | 149 | 3250 | 170 | 6000 |
129 | 1850 | 150 | 3350 | 171 | 6150 |
130 | 1900 | 151 | 3450 | 172 | 6300 |
131 | 1950 | 152 | 3550 | 173 | 6500 |
132 | 2000 | 153 | 3650 | 174 | 6700 |
133 | 2060 | 154 | 3750 | 175 | 6900 |
134 | 2120 | 155 | 3875 | 176 | 7100 |
135 | 2180 | 156 | 4000 | 177 | 7300 |
The table below shows the smallest index under cold tire conditions.
Speed Rating (km/h) | Air Pressure | Load | ||
Bias Tire |
Radial Tire |
Standard Tire
|
Low Profile Tire
|
|
110-120 | +10PSI | +5PSI | -12% | -12% |
96-110 | +10PSI | +5PSI | -4% | -4% |
81-95 | No Increase | No Increase | 0 | 0 |
66-80 |
No Increase | No Increase | +9% | +7% |
51-65 | No Increase | No Increase | +16% | +9% |
31-50 | No Increase | +10PSI | +24% | +12% |
20-30 | No Increase | +15PSI | +32% | +17% |
The table below shows the smallest index under cold tire conditions.
Speed Rating (km/h) | Air Pressure | Load |
110-120 | +10PSI | 10% |
96-110 | +10PSI | - |
81-95 | No Increase | - |
66-80 | No Increase | +9% |
51-65 | No Increase | +16% |
31-50 | No Increase | +24% |
20-30 | No Increase | +32% |
A. Increase speed and load requirements
B. For better handling
However, the increased air pressure should not exceed the specified maximum load, 20 psi, nor exceed the maximum load and air pressure required by the rim.
Over inflation will lead to tire blowout which affects driving safety and increases operating costs!Tube Tire | Tubeless Tire | |||||
Bias Tire | Radial Tire | 90 Series | 80 Series | 75 Series | 70 Series | 65 Series |
7.00-16 | 7.00R16 | 8R17.5 | / | 205/75R17.5 | / | / |
7.50-16 | 7.50R16 | 8.5R17.5 | / | 215/75R17.5 | / | / |
8.25-16 | 8.25R16 | 9.5R17.5 | / | 235/75R17.5 | 245/70R19.5 | / |
7.50-20 | 7.50R20 | 8R22.5 | / | / | / | / |
8.25-20 | 8.25R20 | 9R22.5 | / | / | / | / |
9.00-20 | 9.00R20 | 10R22.5 | / | / | 255/70R22.5 | / |
10.00-20 | 10.00R20 | 11R22.5 | 275/80R22.5 | 295/75R22.5 | 275/70R22.5 | / |
11.00-20 | 11.00R20 | 12R22.5 | 295/80R22.5 | / | / | 385/65R22.5 |
12.00-20 | 12.00R20 | 13R22.5 | 315/80R22.5 | / | 315/70R22.5 | 425/65R22.5 |
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