Setting The Fox Rear Frame Damper; Adjusting The Negative Deflection; Adjusting The Rebound - Bosch Bulls Cross Lite Evo Operating Instructions Manual

6.3.8

Setting the FOX rear frame damper

Only applies to pedelecs with this equipment

6.3.8.1 Adjusting the negative deflection

Notice
If the air pressure in the rear frame damper is
exceeded or undershot, the damper can be
permanently damaged.
Do not exceed the maximum air pressure of
350 psi (24.1 bar). The minimum air suspension
pressure of 50 psi (3.4 bar) must be complied
with.
Negative deflection (sag) is compression of the
rear frame damper caused by the weight of the
rider and their gear (e.g. a backpack), the sitting
position and the frame geometry. This sag is not
caused by riding. Each rider has a different weight
and sitting position. The sag depends on the
rider's position and weight and should be between
25% and 30% of the maximum Rear frame
damper, depending on pedelec usage and
preferences.
 Set the compression adjuster to the OPEN
position.
 Adjust the air pressure of the damper so that it
corresponds to your weight.
 Attach the high-pressure pump to the damper.
Slowly compress the damper over 25% of the
deflection 10 times until you have reached the
desired pressure. This equalises the air
pressure between the positive and negative air
chambers, and the pressure indication on the
pump manometer changes accordingly.
Remove the high-pressure pump.
2
25-30%
3
4
5
Figure 64: FOX rear frame damper
MY20B01-22_1.0_21.06.2019
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The negative deflection (2) is the distance
between the O-ring (4) and the rubber air
chamber seal (1). The total deflection of the rear
frame damper (5) is the distance between the end
of the rear frame damper (3) and the rubber air
chamber seal (1)
 Measure the distance between the rubber air
chamber seal (1) and the end of the
damper (3). This distance is the "total damper
deflection" (5).
 Put on your usual bicycling clothing, including
luggage. Sit on the pedelec in your usual riding
position and support yourself against an object
such as a wall or tree.
 Push the O-ring (4) downward against the
rubber air chamber seal (1).
 Get off the pedelec without allowing it to
deflect.
 Measure the distance between the rubber air
chamber seal and the O-ring. This dimension is
the sag. The recommended sag value is
between 25% (hard) and 30% (soft) of the
"total damper deflection" (5).
 Increase or reduce the air pressure until you
have reached the desired sag.

6.3.8.2 Adjusting the rebound

The rebound defines the speed at which the rear
frame damper rebounds after being loaded. The
rebound setting depends on the air pressure
setting. Higher sag settings require lower rebound
settings.
Figure 65: FOX rebound adjuster wheel (1) on the rear
frame damper
 Turn the rebound adjuster clockwise to the
closed position until it stops.
Operation
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