Zero FXS 2019, Owner'S Manual

Page: 58 / 158

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.
7. Bounce the suspension a couple of times.
8. Have a second assistant take a measurement using the
same locations as in step 2.
9. Record this measurement (this is the measurement
referred to as M2 ).
Zero Owner's Manual (FX and FXS).book Page 14 Tuesday, October 23, 2018 1:54 PM