470 WHEELS AND TYRES MAINTENANCE AND INSPECTION OF TYRE/ WHEELASSEMBLY (a) Visual inspection Visually inspect the tyre and replace the same if any of the following defects are found : 1. Bumps or bulges in the tread or the side of the tyre. 2. Cuts, splits or cracks. 3. Excessive tread wear or non uniform tyre wear. (b) Inflation of tyres Check tyre pressures when tyres are cold. Correct tyre pressure is necessary to give the best combination of riding comfort, handling, tyre life and better fuel efficiency. It is normal for tyre pressure to increase when the tyres become hot during driving. Do not bleed or reduce tyre pressure after driving. Bleeding reduces the “Cold Inflation Pressure”. Recommended tyre pressures are : Front: 28 psi / 190 kPa Rear: 30 psi / 230 kPa Spare: 30 psi / 230 kPa WARNING : Driving with uneven pressures on different sides may reduce handling performances during certain driving maneuvers. The balance of the vehicle is also upset and tyre wear will be uneven. Higher than recommended pressure (Over - inflation) can cause : 1. Bumpy and harsh ride 2. Tyre brushing or carcass damage 3. Rapid tread wear at the center of tyre Unequal pressure on same axle can cause : 1. Uneven braking 2. Vehicle pull 3. Reduced handling 4. Swerve on acceleration Lower than recommended pressure (Under - inflation) can cause : 1. Tyre squeals on turns. 2. Hard steering 3. Rapid and uneven wear on the edges of the tread 4. Tyre rim bruises and rupture 5. Tyre cord breakage 6. High tyre temperature 7. Reduced handling 8. High fuel consumption Excessive shoulder wear can indicate under inflation while wear to the centre of the tread can mean over inflation. Both - over inflation and under inflation tread wear pattern are shown below.
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