Use the following two methods to correct tires which cause a vibration, although the tires are balanced properly:
- This method uses an automatic machine that loads the tire and buffs small amounts of rubber from high spots on the outer two tread rows.
- The second method is to vector the tire and the wheel assembly. Refer to Vectoring .
| • | Using this method in order to correct the tires is usually permanent. This method does not significantly affect the appearance or the tire tread life. |
| • | Do not true the tires with a blade-type machine. This reduces the tread life substantially, and this often does not permanently correct the problem. |
Check the tires monthly or before any extended trip. Adjust the tire pressure to the specifications on the tire label. Install the valve caps or extensions on the valves. These keep out dust and water.
The kilopascal (kPa) is the metric term for tire inflation pressure. The tire pressure may be printed in both kilopascal (kPa) and psi. One psi equals 6.9 kPa.
kPa | psi | kPa | psi |
|---|---|---|---|
140 | 20 | 215 | 31 |
145 | 21 | 220 | 32 |
155 | 22 | 230 | 33 |
160 | 23 | 235 | 34 |
165 | 24 | 240 | 35 |
170 | 25 | 250 | 36 |
180 | 26 | 275 | 40 |
185 | 27 | 310 | 45 |
190 | 28 | 345 | 50 |
200 | 29 | 380 | 55 |
205 | 30 | 415 | 60 |
Conversion: 6.9 kPa=1 psi | |||
Tires with a higher than recommended pressure can cause the following conditions:
| • | A hard ride |
| • | Tire bruising |
| • | Rapid tread wear at the center of the tire |
Tires with a lower than recommended pressure can cause the following conditions:
| • | A tire squeal on turns |
| • | Hard steering |
| • | Rapid wear and uneven wear on the edge of the tread |
| • | Tire rim bruises and tire rim rupture |
| • | Tire cord breakage |
| • | High tire temperatures |
| • | Reduced vehicle handling |
| • | High fuel consumption |
| • | Soft riding |
Unequal pressure on the same axle can cause the following conditions:
| • | Uneven braking |
| • | Steering lead |
| • | Reduced vehicle handling |
