This top of the line F850GS (-25mm lowering) fork cartridge kit fits into the right
fork leg without modifications to the fork. The cartridge is closed,
that the cartridge is like a separate, pressurized shock absorber inside
the fork with its own damping fluid for optimal performance.
NOTE: For lowering a standard height model, must purchase 35000135S TracTive Adjustable Preload insert for left fork (see above to add to cart).
originally developed in close cooperation with adventure riders, world
travelers and rally riders. The products have proven their value over
the years: hugely improving off-road performance while retaining
comfort for on and off road use. This is largely due to the huge size of
the damping piston at 35mm in diameter. This size of piston is the
largest of all aftermarket suspension providers.
Apart from a high oil flow, this piston size allows for stable and
well-controlled damping behavior. The size of the internal bore also
allows the use of electronic systems on Dynamic Damping models,
and the cartridges were also further developed for use in road racing.
cartridge design has proven to be reliable and finely tunable. Every
cartridge can be easily opened and serviced,
or the damping can be tuned for the customer’s application. Spring rate,
spring preload and air chamber are easily modified and there is a wide
range of springs available to suit every load and riding condition. The
fork retainer cap
at the top of the fork provides easy access to the adjusters, and
contains a deaeration screw to equalize pressure buildup which can be
common in telescopic fork systems. At the end of the stroke there is a
hydraulic anti-bottoming system which prevents hard bottoming over large
The adjusters provide 20 clicks of damping adjust and 12mm of preload
- Fork cartridge fully assembled and ready to drop into right fork tube.
- Fork oil.
- Fork adjusting tool.
- Fork cap tool.
Fork oil is just for lubrication, cartridge is sealed, closed, and runs its own oil.
Since you are replacing only one cartridge, you will need to set the
height of the tube with the new cartridge in the triple clamp so that
the axle slides easily between both slider tubes. The top of the right
tube may sit a bit higher than the left tube, this is perfectly OK.
Start with the right tube
protruding above the top triple clamp by 5mm
and then adjust this height until the axle fits smoothly through both
recommended air chamber is 65mm for general use, 60mm for more off road
riding. Air chamber is the measurement of the oil level to the top of
the tube with spring removed and fork fully compressed.
Skills, experience and special tools are required to change to the shorter damper rod in the left fork when installing the lowering cartridge in the right fork of a standard height model. Not recommended job for the home mechanic. Beemershop charges $200.00 to install the right cartridge kit and the shorter damper rod in the left cartridge, off-bike.