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On a Z-link, four-bar type of rear suspension, there is an indexing effect as the chassis travels that rotates the birdcage and, along with it, causes changes in the height of the bottom of the spring mount. In this example, as the chassis moves down, the arms straighten out, causing the birdcage to rotate and, along with it, the spring mount. When the spring is mounted behind the axle tube, the indexing stiffens the rate felt by the chassis on that side. View Related Article
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