When the ATV is turning into a corner the front suspension compresses and the TricTrac worm threaded shaft forces the upper A-Arm Forward. This Forward Movement causes the castor angle to decrease and become more negative. Negative castor helps the ATV steer into a corner better.
When the ATV is heading down a strait-away, the front suspension becomes light and fully extends it-self, the TricTrac worm threaded shaft forces he upper A-Arm Backward. This Backward Movement causes the castor angle to increase and become more positive. Positive castor helps the TV feel less twitchy down a strait-away, which makes the rider feel more stable.
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