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its so that when you are turning greater angles, such as parking, the steering will turn much faster as the teeth on the rack decrease in pitch towards each end of the rack. However, the teeth in the centre of the rack increase in pitch, so the steering is not too sensitive whilst driving in a straight line, as this could be dangerous.

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Bailee Hand

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Q: Why a variable-pitch rack and pinion system is sometimes used?
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Related questions

In a rack and pinion steering system what protects the rack from contamination?

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What item is not part of the suspension system?

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