Don’t forget to torque all the bolts you hand-tightened to prevent
See those numbers? They mean something. This is a 450-pound
spring, which means it takes 450 pounds of force to compress the
spring 1 inch. Springs usually come in 50-pound increments and
are used to adjust sag, the same way air pressure is used with air-sprung shocks.
Measure sag the same way with coil shocks you would with air
shocks. The shock should use up about 20–35 percent of the
travel, while on the bike, balanced in the riding position. You may
need a friend to help you take this measurement. This Pivot’s
shock has 57 millimeters of stroke*, so at sag, the shock should
compress roughly 11–20 millimeters.
If your setup doesn’t work with your current spring, it’s time to
swap for a different one. We’ll demonstrate with this Fox DHX 5.0
that’s been “pushed” for the step-by-step.
With the shock off the bike, unthread the preload collar to give the
spring a little freedom to move.
*Shock stroke measures how much the shock can compress
before bottoming out. It’s different than rear-wheel travel. When
measuring this, you’re only measuring the amount the shock
compresses and not how much the wheel has moved through its
travel. This 6-inch-travel bike only has a 2.5-inch stroke shock.