Sag Set Up
The following areonly general recommendations, different riding styles, tracks and manufacturerbrands may vary these setups.
65cc:, 70 – 75mm 85cc: 85 – 90mm 125cc: 100– 120mm 250cc / 450cc: 95 – 110mm
• Measurement: 1st Place the bike on a centre standwith your wheels un-weighted. You take a measurement from the rear axle to afixed point vertically on the guard above Making a small mark with a pen on theguard for a reference point is a good idea.
• Measurement: 2ndTake the bike off the stand, place the rider with gear on the bike with anormal riding position (not too far forward or too far back) with their feetbarely touching the ground or on the pegs with someone helping to aid balance.Take another measurement from the same two points as before.
Too much rider sagindicates you must increase pre-load to the spring by firstly loosening thespring adjuster found at the top of the spring. Then adjust by turning thelower adjuster ring clockwise. Too little rider sag indicates you must decreasepre-load by turning the spring pre-load adjuster counter clockwise. Next youshould check your bike’s free sag.
• Measurement: 3rd Take the bike off the stand andbounce on the bike to allow the suspension to settle. With the rider off thebike take a measurement between the same two points again.
• Free sag Subtractmeasurement 3 from measurement 1. Your bike should sagapproximately 25 – 35mm by itself off the stand after your have setrider sag. Hint: Less than 25mm indicates a stiffer spring is needed and morethan 35mm indicates a softer spring is needed
Racesag is the change in distance from full suspension extension to ride heightwith riding on bike.
Racesag should be properly set prior to checking static sag. Use the samemethod to measure static sag that is used to measure race sag. Tocalculate static sag you need the measurement with the bike on the stand andthe measurement with the bike off of the stand without a rider on it. This will reveal the amount that the rear sags under its own weight. Theappropriate range for a 125cc-650cc bike is 20mm-45mm. If the bike sagsmore than the desired range, the rider will need a softer shock spring. If the bike sags less than the desired range then the rider will need a stifferspring.