Zero Motorcycles DS 2021, Owner'S Manual

Page: 58 / 160

General Operation
4.14
Rear Shock Adjustment
Measuring Preload
Obtaining the correct rear spring preload (sag) is critical for
proper handling. The spring preload must be set to match the
weight of the rider. The spring is preloaded for a 180 lb (82 kg)
rider. This puts the rear tire 1/3 of the way through its vertical
travel. Heavier riders and motorcycles carrying additional cargo
or accessories require stiffer spring rates. A good
approximation of your rear spring requirements can be found by
measuring the rear suspension’s sag. This measurement quickly
determines if your rear spring is approximately correct for your
weight. This adjustment is a recommended guideline; personal
riding preference may vary from the specifications given.
To Check the Sag Value:
1. Support your motorcycle on a stand with the rear wheel off
the ground.
2. Measure vertically from the rear axle to the rear fender. Mark
this spot as it is used for other measurements.
3. Record this measurement (this is the measurement referred
to as M1 ).
4. Remove the motorcycle from the stand.
5. Wearing your normal riding apparel, sit on the motorcycle.
6. Have an assistant hold the motorcycle up, your feet should
be on both pegs.
Zero Owner's Manual (S and DS).book Page 14 Monday, September 21, 2020 11:43 AM