the longer arm, has a lower ratio of torsional twist to the upstroke of the suspension arm.
eg.
Short link, 15mm of suspension travel = 47' of torsional twist (stiff action)
long link, 15mm of suspension tavel = 30' torsions twist (soft action)
Running an ARB can allow for slightly softer springing and damping on your suspension, to cope with a rough track, with the ARB controlling pitch into and out of a corner.
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