BMW F800GS Forks
F800 GS Forks 2013 onwards - WP.
BMW switched to WP forks for 2013. While it's a good move as the internals can now be revalved, there are no external adjustments. We can get the stock forks working very well if you can live without adjusters. Stock springs are 0.54kg/mm, good for riders up to 110kg.
Our most poular mod is revalving the stock WP cartriges and produces great results. Every complaint from "too soft" to "too harsh" is addressed in our comprehensive, dyno verified revalve. Plus seals and springs if required.
From Years Up To 2012 - Marzocchi.
The forks are really the bug bear of the BMW F800 motorcycle. The stock forks are very soft. A later version had adjustable rebound but they are unchanged internally, spring rate or dampening. Usually we can disassemble the cartridge and make changes (revalving). Unfortunately this is not the case with the Marzocchi fork as the cartridge tube is steel, peened over at the ends. Even if you destroy the tube to get it apart, what's inside is disappointing and not modifiable.
Stiffer fork springs and heavier grade oil are a good cheap mod. Not a perfect answer but better than stock. Stock springs are 0.48kg/mm, we have rates from 0.44 to 0.85kg/mm. Find the rate you need HERE.
Bitubo BMW Fork Cartridge Kit.
This is a drop in kit including springs. They don't stand up to much off road use. There is an ADVRider thread about them HERE. We can service and modify the Bitubo units to make them more reliable. It seems Bitubo didn't do much durability testing.
We take a set of Marzocchi Shiver MX or offroad forks with compression and rebound adjustment and graft them into the GS fork. We also revalve the cartridges so they are suitable for the GS and use an appropriate spring rate. While this is not a cheap conversion, it's much better than the Bitubo option. It does lack external spring preload adjustment though. The axle feet are machined out so you have compression adjustment at the bottom and rebound at top.