Zero Motorcycles ZERO SR, Owner'S Manual

Page: 69 / 136

General Operation
4.21
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 an
180 lb (82 kg) rider. This puts the rear tire 1/3 of the way
through its vertical travel. Heavier riders 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 (S and DS).book Page 21 Tuesday, January 20, 2015 2:37 PM