DT SWISS F 535 ONE Technical Manual page 9

2.3 SPRING
The Line Air system consists of a bypass located in the air chamber. The bypass ensures that the pressure inside the negative
air chamber is higher than in the positive air chamber when the fork is fully extended. This reduces the force of the beginning
stroke. The fork responds very smooth and offers more comfort and traction.
FUNCTION IN DETAIL
After inflating or changing the air pressure:
When the fork compresses, the piston moves over the bypass
of the air chamber.
When the piston is located on the bypass, the bypass ensures
a pressure equalization of the positive and negative air
chamber (see red arrow).
Function during operation:
Due to the pressure equalization, the pressure in the negative
air chamber is higher than in the positive air chamber when
the fork is fully extended. This increased pressure inside the
negative air chamber counteracts to the breakaway torque
and improves the response characteristics drastically.
When the fork is compressed further, only the air inside the
positive air chamber is compressed.
When the fork extends again, a pressure builds up in the
negative air chamber and the cycles starts again.
figure 3: Pressure compensation via the bypass valve
figure 4: Pressure conditions with unloaded fork
F 535 - technical manual 9