DT SWISS F 535 ONE Technical Manual page 8

High speed compression (HSC)
Additionally, the oil flows through the oil channel of the high-speed compression (HSC). Shims are placed at the end of the oil
channel. These shims only open when a defined oil pressure is attained. Oil which cannot flow through the oil channels of the
LSC (because of fast deflection of the fork, and thus big displacement of the oil generated by the piston), flows through the oil
channels of the HSC. This ensures separate damping characteristics on small and medium or on fast compression speeds.
In «DRIVE» mode, the oil channel of the «OPEN» mode is closed. The oil flows through a separate oil channel onto a special
shim stack (see figure 1DRIVE).
In mode «LOCK» (see figure 1LOCK), a slider closes the oil channels of the low-speed compression (LSC) and high-speed
compression (HSC). The oil can only flow through the blow-off channel. Shims at the end of the blow-off channel open the
access to the HSC channel at a defined oil pressure. The blow-off itself does not represent a damping function, it protects
rider and material from big hits.
2.2 REBOUND
The preloaded floating piston pushes the oil from the
upper part of the damping unit into the oil chamber when
the fork is released. The oil can flow directly from the
upper unit of the damping unit into the oil chamber.
The rebound damping happens in the damping piston.
Low-speed rebound (LSR)
When the fork rebounds slowly, the oil flows through the
oil channel of the low-speed rebound (LSR). An adjusting
needle, which position can be adjusted with the red
rebound adjuster, controls the flowing resistance through
the LSR oil channel. The position of the adjusting needle
controls the flow resistance of the oil and thus the intensity
of damping. The higher the flow resistance, the higher the
damping.
High speed rebound (HSR)
Additionally, the oil flows through the oil channel of the
high-speed rebound (HSR). Shims are placed at the end
of the oil channel. These shims only open when a defined
oil pressure is attained. Oil which cannot flow through the
oil channels of the LSR (because of fast rebound speed of
the fork and thus big displacement of the oil generated by
the piston) flows through the oil channels of the HSR. This
ensures separate damping characteristics on small and
medium or on fast rebound speeds.
LSR HSR
figure 2: Rebound - Function in Detail
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