AUGUST 2014 / DIRT BIKE 85
You must be on flat ground!
Always set the sag with the shock cold.
This wheel is too forward in the swingarm.
This wheel is perfect. A little past the middle adjustment is
Have the rider sit on the machine, legs dangling
in front of the pegs, canted forward slightly with
a straight back. Hands are on the bars.
Have the person holding the bike
bounce the machine up and down.
Take the first measurement with the bike on the
stand with no pressure on the shock. Measure
from the rear axle to the rear fender junction.
Bones suggests 103mm as a proper point for sag.
That’s the difference between the unloaded
measurement and loaded (with the rider aboard).
To reduce sag, add preload to the shock spring.
To add additional sag, turn out (or counterclockwise) on the shock spring.
Be consistent with your measurements!
This sounds easy, but Bones told us that if you ask 10
mechanics on the pro circuit how to do it, you’ll get 10 different answers. Here’s the Bones Pro Circuit method for
setting race sag with the rider aboard. You’ll need a tape
measure, which Pro Circuit supplies with their suspension
mods, and another person to help hold the machine.
Always try to run your rear wheel as far back as possible.
This adds leverage, lets the shock work smoother and
takes some of the rigidity out of the chassis. This is very
important, especially when you’re changing rear sprocket
sizes, as this can dramatically change the wheel position in