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Which component carries the front wheel and pivots for steering?

  • A.The stub axle or hub carrier
  • B.The track rod, which connects the two stub axles together so that they turn through the correct relative angles
  • C.The steering arm
  • D.The kingpin, which is the pin about which the stub axle pivots and is carried within the eye of the axle beam

Answer: A

The stub axle carries the wheel bearings and pivots about the kingpin or about the ball joints of an independent suspension. The steering arm projects from it to receive the track rod. On a modern car the equivalent component is usually called the hub carrier or upright. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision. Naming what changes and what stays the same is the reliable route through questions of this shape.

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