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

Maintain directional control
Bring the road contact of the tyre under the point of load
Prevent uneven tyre wear
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 tread grooves pass air between the tyre and road surface, thereby preventing tyre from overheating
The crests between the tread grooves absorb road noise
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

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