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Why in the world would you want to adjust the castor angle?

The only thing it really does is stabilize the steering.

As for changing it, you would have to relocate, backwards or forwards, the upper ball joint. This would require some kind of strange variable geometry A arm where the two arms of the A AND the cross-link were all able to be varied and locked down.

Basically, an engineering nightmare. Then there's the whole issue of handling the uneven forces at the subframe mount.

Something tells me that most race suspensions don't even have a castor adjustment. Its really a third order thing, and not too important.

Its been a while since I've been reading suspension texts, but I remember it distinctly being no big deal.
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