Öhlins shock absorber TTX Road & Track BM 678 for BMW R 1200 GS Adventure 2006-2013

Product Details

Öhlins TTX GP shock absorber Road & Track BM 678, monoshock, gas-pressure twin-tube damper with externa fixed reservoir; adjustable rebound damping, adjustable compression damping damping; externa remote hose-mounted hydraulic spring preload adjuster; piston diameter 39 mm; with component certificate according to application list for BMW R 1200 GS Adventure, model year 2006-2013

General Description

Cavitation is devastating for a shock absorber, as it means the loss of damping and is therefore something you absolutely do not want to experience in your shock absorber.
The small bubbles that form in the oil during cavitation can never support the desired damping properties of your shock absorber.

Traditionally designed dampers can easily fall victim to cavitation under extreme conditions due to the low pressure behind the piston.

The TTX system was designed by Öhlins development engineers to prevent the risk of cavitation in the shock absorber. The plan worked. Thanks to the clever pressure balance of TTX technology, the risk of cavitation was banished from the shock absorber.

The 'TT' stands for 'Twin Tube', i.e. the twin-tube design, while the 'X' in the designation describes the flow direction, or the arrangement of the valves in the cylinder head of the TTX shock absorber.
Thanks to TTX technology, the pressure that normally builds up directly above the piston is directed towards the cylinder head and to the adjusters for compression and rebound damping.

It then travels into the free space between the inner and outer tube to the opposite side of the piston. All of this happens so quickly thanks to ingenious bores and clever channel routing that one can almost speak of a balanced pressure ratio on both sides of the piston.

The reservoir of the TTX damper is only used during compression and rebound of the shock absorber to either absorb oil expanded by heat or oil displaced by the piston shaft, or to return it to the circuit. Inside the reservoir, there is a separating piston between the damper oil and the nitrogen located on the other side of the separating piston. The gas generates an oil pressure of six to nine bar, which essentially corresponds to the static pressure on both sides of the main piston.

In addition to its use in shock absorbers, Öhlins also relies on TTX technology for the construction of front wheel forks and cartridge kits. As is well known from Öhlins, TTX technology was also first introduced in the racing sector after long series of tests to win races and championships there under extreme conditions.
Just two years after its introduction in racing, TTX technology was available for everyone to purchase. After its great success in sport and with supersport and superbike motorcycles for street, the development has now also made its way into the field of dual-sport motorcycles and adventure touring bikes. TTX technology is also equipped for use in mechatronic segment.