Bosch BULLS Twenty 6 EVO, Translation Of The Original Operating Instructions, Page: 58 / 116

MY20B01 - 52_1.0_02.10.2019
58
Operation
6.5.8 Setting the Suntour rear frame
damper
Only applies to pedelecs with this equipment
6.5.8.1 Adjusting the negative deflection
Negative deflection depends on the rider's weight
and sitting position. The recommended negative
deflection should be between 25% and 30% of the
total rear frame damper deflection , depending on
preferences and pedelec use.

When adjusting the negative deflection, ensure
that the pressure level adjuster is in an open
position, i.e. the
lockout lever is in the OPEN
position.
1 Remove the valve cap from the air valve .
2 Attach a high-pressure damper pump.
3 Adjust the rear frame damper air pressure to
the rider's weight.
4 Detach high-pressure damper pump.
5 Measure the distance between the air chamber
seal and the end of the rear frame damper. This
gap is the
total rear frame damper deflection .
6 Put on your normal cycling clothing, including
luggage.
7 Sit on the pedelec in your usual riding position
and support yourself against an object, such as
a wall or tree.
8 Push the O-ring downwards against the air
chamber seal.
9 Get off the pedelec without the suspension fork
deflecting.

Measure the distance between the air chamber
seal and the O-ring. This measurement is the
negative deflection. The recommended value
is between 25% (hard) and 30% (soft) of the
total rear frame damper deflection .
10 Increase or reduce the air pressure until you
have reached the desired negative deflection.

If the negative deflection is correct, fasten the
valve cap onto the valve.
6.5.8.2 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 62: Suntour rebound adjuster wheel (1) on the rear
frame damper
 Turn the rebound adjuster wheel in the
– direction to increase rebounding.
 Turn the rebound adjuster wheel in the
+ direction to reduce compressive deflection
movements.
6.5.8.3 Setting the compression
You can use the pressure damper setting to adjust
the rear frame damper to the ground conditions.
The pressure damper setting defines the speed at
which the rear frame damper rebounds after being
subjected to load or impact.
Figure 63: Suntour pressure level adjuster on the rear
frame damper

Turn the pressure level adjuster towards the
– symbol to increase rebounding.

Turn the pressure level adjuster towards the
+ symbol to reduce compressive deflection
movement.
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
300 psi (20 bar).
1
1