BMW F800GS Forks
F800 GS Forks - 2013 onwards - WP Forks
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, which are good for riders up to 110kg, but more rates are available in our 19-130 Series Fork Springs.
Our most popular mod is revalving the stock WP cartridges and it produces great results. Every complaint from "too soft" to "too harsh" is addressed in our comprehensive, dyno verified revalve.
F800 GS Forks - Up To 2012 - Marzocchi Forks
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. With most forks 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 and 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 in our 19-145 Series Fork Springs.
Marzocchi Shiver Conversion
Since Marzocchi went bust in 2015 the parts are too hard to get and too old to make this conversion viable. We used take a set of Marzocchi Shiver MX or Offroad Forks with compression and rebound adjustment and graft them into the GS fork. It required complete revalving and machining the axle feet feet for the compression adjuster too, and lacked an external spring preload adjuster. The Andreani Cartridge Kit is almost as good and much easier and cheaper, and it's what we'd recommend instead.
Bitubo BMW Marzocchi 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.
Andreani Drop in Cartridge Kit for Marzocchi Forks
Compression one leg, rebound the other. Adjustable spring preload. Well made and comes with springs.