rugbug - this is from balderstins web page
Optimised spring travel and suspension settings
Whether on gravel paths, sand tracks, rough terrain or over long distances, the chassis of the R1150 GS Adventure ensures optimum comfort and control even when fully loaded. Spring travel has been increased by 20 mm to 210 mm at the front and 220 mm at the rear. Easy spring pre-load adjustment to the front can be made by a supplied spanner and to the rear by a hydraulic adjuster. Rebound damping at the rear can be adjusted by means of a small screw. For the first time in a BMW motorcycle, a shock is used at the rear which has suspension deflection related damping, whereby the greater the spring deflection, the greater the damping effect. The WP shock is characterised by sensitive response and a high degree of knock resistance