Effects of Under-inflation:
1. Uneven tread wear, more wear at tyre sides.
2. Lack of directional stability.
3. Increased rolling resistance leading to increased fuel consumption.
4. Excessive flexing of sidewall causes build up.
5. Vehicle will roll on curves.
Effects of Over-inflation:
1. Reduced tread contact area with road surface.
2. Reduced tyre grip.
3. Increased vibration resulting in uncomfortable ride.
4. Increased stresses may causes tread separation and crack in the side wall.
5. The centre of tyre will be worn rapidly
Necessity of tyre rotation:
● Tire rotation is important for tread wear and long tire life.
● Tire rotation can also result in performance advantages.
● Rotation is important because in most cases, the tires on the front axle need to accomplish very different things than the tires on the rear axle
Tyre rotation procedure for a four wheeler: Tyre rotation is the practice of moving the wheels and tires of an automobile from one position to another, to ensure even tire wear. Even tyre wear is desirable to extend the useful life of a set of tyres. The weight on the front and rear axles differ which causes uneven wear.The pattern of tyre rotation differs for the front wheel drive vehicles and rear wheel drive vehicles. A good example is Front Wheel Drive vehicles which places braking, steering and driving forces on the front axle tyres. Rear axle tyres only receive braking forces resulting in a much faster wear rate for the front axle tyres. Tyre rotation for these vehicles therefore becomes very important for optimum tyre life. Tyre rotation should be undertaken every 5,000 to 8,000 kilometers, even if there is no sign of uneven wear. The "Cross Pattern" provides the best results and can be performed on any Front or Rear Wheel Drive vehicle equipped with 4 non-unidirectional tyres. (Unidirectional tyres must be rotated front to rear only). Free rolling axle tyres are crossed and installed to the drive axle, while the drive axle tyres are brought straight to the free rolling axle (without crossing).