Set Up Suspension 101
3-4. Checking your machine's sag and free sag are how you determine the proper spring and spring preload. Begin by measuring the quad topped out by lifting up the back until the shock is fully extended (3). Free sag is the amount your machine sags without the rider and should be about 10 percent of the travel (multiply the travel of your quad by 0.1 to calculate the desired free sag) (4). The final and most-crucial measurement is the sag with the rider sitting in the middle of the seat. That should be one third of the travel (multiply the travel by 0.333). If it is more than this, you need to tighten your spring and vice versa.
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