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

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Automobile Engineering in ME
The basic function of the suspension is to

Ensure that wheel alignment is not disturbed during driving
Automatically correct the effects of over steering
Ensure that the steering wheel can deliver a suitable amount of steering force
Absorbs vibration and impact forces from the road surface

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Automobile Engineering in ME
The order in which effort applied to the steering wheel is transferred to the front wheel is

Steering wheel, steering gearbox, steering shaft, tie rod, steering knuckle, front wheels
Steering wheel, tie rod, steering gearbox, steering shaft, steering knuckle, front wheels
Steering wheel, steering shaft, steering gearbox, steering knuckle, tie rod, front wheels
Steering wheel, steering shaft, steering gearbox, tie rod, steering knuckle, front wheels

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