TTX shock absorber Road & Track BM 148

Cavitation. Something you don’t want in your shock absorber. It’s devastating because basically it means
the damping is lost. Small bubbles in the oil can never create the necessary damping forces. Traditional
dampers working in extreme conditions sometimes suffers from low pressure on the piston backside.

The TTX was created by Öhlins engineers to eliminate the risk for cavitation. They succeeded. With the TTX technology a positive pressure balance is created in the shock which means the risk for cavitation is gone.

TTX stands for Twin Tube with the X illustrating how the flow through the valves in the cylinder head is
designed. Thanks to the twin tube technology the pressure usually created on top of the piston is transferred
through the cylinder head and the adjusters for compression and rebound, then flows through the space between the inner and outer tube to the other side of the solid piston.

These equals to a pressure balance
within the shock. The outer reservoir is only used to take care of the oil displacement from the piston
rod and heat expansion, which is why it can be fairly small in design. Inside the reservoir there is a dividing
piston between the oil and the nitrogen gas.

The gas pressurizes the oil to a level between six and nine bars, basically the static pressure on both sides of
the solid piston. TTX technology is also used with a lot of success in the racing cartridge kits and front forks.
As with a lot of new technology from Öhlins the TTX technology was first introduced in racing after an intensive
testing period and it instantly delivered a lot of wins and championships.

Just two years later it was available to any privateer and quickly adapted to street applications as well. After a lot of success in racing and the sport and hypersport segment, it has now also been made available for Adventure type bikes.

The TTX layout also makes these shocks ideal to use for electronically controlled (EC) suspension.

Fits for vehicles

  • BMW R 1200 GS Adventure (2014 – 2016)

    • Component certificate (TÜV approved)
  • BMW R 1200 GS Adventure (2017 – 2018)

    • BMW R 1200 GS Rallye (2017 – 2018)

      • No approval

    Part number

    BM 148

    Type Code


    Twin tube

    Twin tube

    Piston diameter

    Piston diameter: 39 mm

    type P

    Monotube high pressure gas type of shock absorber with external “piggy back” reservoir.

    TTX36 R1 rebound damping adjuster
    TTX_GP R1 rebound damping adjuster

    Adjustable rebound damping. Black adjuster on TTX36 shocks / silver adjuster on TTX GP shocks.

    TTX36 C1 compression damping adjuster
    TTX GP C1 compression damping adjuster

    Adjustable compression damping. Gold adjuster on TTX36 / TTX GP shocks.


    Hose mounted hydraulic spring preload adjuster.

    Technical data

    Packaging unit:pieces