Automobile Engineering in ME
Caster is a

Forward tilt of the kingpin
Forward tilt of the kingpin OR Backward tilt of the kingpin
Backward tilt of the kingpin
None of the listed here

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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
It is desired to have more flexibility in design
Large changes in load make it necessary to have a large suspension stroke

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