Originally Posted by Angryrican
I just installed a set of Xchallenge cartridges with Ohlins 55g springs and 7.5 weight oil at the Ohlins recommended 60mm air gap.
I'm not sure how the Xchallenge gets 40mm more travel since the springs are the same part # as the F800GS and the cartridge bodies are actually 5mm longer then the F800's. the only thing I can think of is the 100lb weight difference and the preload spacer are what shorten the F800's travel. The fork legs extend within a few millimeters of where they did before install and of course the springs need to break in and settle so it should be the same.
I won't be able to ride it today since we are getting 30-40 mph wind gusts but the initial few rides around the block seemed promising and nose dive under breaking is now limited and smooth versus the previous quick and jerky
I spent $300~ on this mod, $100 for the cartridges used, $140 for the springs and $40~ for oil and new bottom screw washers and now I have adjustable compression and rebound damping
So after measuring and looking at the different parts between the XChallenge this is what I found and concluded;
-The upper fork tubes are 40mm shorter on the Xchallenge allowing the extra 40mm of travel
-springs are the same part # between both bikes
-only the F800Gs has the preload spacer(most likely making up for the extra weight)
-as said before this is plug n' play for the F800gs and requires zero modification to fit
My first ride on pavement with a short but rocky 5 mile trail have proved promising so far, bike feels very planted on road and offroad it has become point and shoot vs. react and hold on for full stock(this is in conjunction with the Wilber's rear shock)