Automobile Engineering in ME
The basic purpose of providing caster angle on wheels is to

Prevent uneven tyre wear
Bring the road contact of the tyre under the point of load
Maintain directional control
Compensate for wear in the steering linkage

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

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
The tread grooves pass air between the tyre and road surface, thereby preventing tyre from overheating

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