Automobile Engineering in ME
An imbalance wheel during vehicle operation

Bounces vertically or deflects from side to side (as seen from front or rear)
Deflects in the vehicle's longitudinal direction
Creates a standing wave
Makes large noise when its heavy point hits the road surface

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Automobile Engineering in ME
The main function of the tread pattern on tyre is that

The tread grooves pass air between the tyre and road surface, thereby preventing tyre from overheating
The crests between the tread grooves absorb road noise
The tread pattern protects the tyre's inner carcass from small stones and pieces of glass
In wet conditions, the tread grooves expel water that is drawn between the tyre and road surface

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