CAS­TOR WHAT?

4 x 4 Australia - - Custom4x4 -

EVER pushed a shop­ping trol­ley around with one bung wheel that con­stantly sends the trol­ley into or­bit? It’s the re­sult of cas­tor, or the re­la­tion­ship be­tween the top and bot­tom mount­ing points of a front wheel. In a live-axle 4x4 it’s the dif­fer­ence be­tween the top and bot­tom king­pin bear­ings; on in­de­pen­dent sus­pen­sion it’s the up­per and lower ball joints. When the sus­pen­sion is lifted as lit­tle as 50mm, it can throw that an­gle right out of whack, caus­ing twitchy steer­ing, track­ing, and all sorts of dan­ger­ous is­sues. Af­ter­mar­ket con­trol arms, cas­tor plates, drop arms and off­set bushes are all bolt-on ways of get­ting it back into spec.

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