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Which effect does deliberate roll steer serve on a rear axle?

  • A.Reducing the tyre wear, which follows from the wheels remaining aligned with the direction of travel in a corner
  • B.Improving the ride
  • C.Increasing the suspension travel, which allows a softer spring to be used without the suspension bottoming out
  • D.Tuning the understeer balance of the vehicle

Answer: D

Arranging the rear suspension so the outer wheel toes in slightly as the body rolls steers the rear gently into the corner and adds stability. Semi-trailing arms and compliance steer are both used for it. It is a deliberate design tool. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.

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