Zero Motorcycles S 2021, Owner'S Manual

Page: 53 / 160

General Operation
4.9
Front Suspension Adjustment
A shock has two main actions: compression when the shock
gets loaded, and rebound when the shock returns back to full
length. Compression damping is the adjustment that determines
how fast or slow the fork compresses. Rebound damping is the
adjustment that determines how fast or slow the fork rebounds.
Measuring Preload
Obtaining the correct front suspension 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 lbs
(82 kg) rider. This puts the front tire 1/3 of the way through its
vertical travel. Heavier riders require stiffer spring rates. A good
approximation of your front springs requirements can be found
by measuring the front suspension’s sag. This measurement
quickly determines if your front springs are 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 upright on a stand with the front
wheel off the ground.
2. Measure vertically from the bottom of the fork tube to the
bottom of the tube’s dust seal.
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 upright, your feet
should be on both pegs.
Zero Owner's Manual (S and DS).book Page 9 Monday, September 21, 2020 11:43 AM