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 rigid suspension is beneficial when

It is desired to improve tyre to ground contact characteristics
It is desired to reduce the unsprung mass
Large changes in load make it necessary to have a large suspension stroke
It is desired to have more flexibility in design

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