Wilbers Zero Friction Progressive Fork Springs R100GS '88-On

The original BMW fork spring for the R100GS is 4.5 N/mm which is a good starting rate for the standard R100GS, but with 225 mm of front suspension travel this bike suffers from lots of nosedive under deceleration and braking, and it can blow through the stroke quickly off road with no fork adjusters to tame all that chassis movement. The Wilbers spring kit solves this problem starting at the same 4.5 N/mm rate, but then after about 130 mm of fork compression it gradually engages a stiffer 5.8 N/mm stage built into the springs which greatly reduces nosedive and prevents rapid compression on or off road. You have the benefits of a comfortable compliant ride but with reduced chassis movement and less bottoming over the rough stuff.  

For R100PD models please see our part number 600-0087-01

Don't forget the Fork Oil!  You will need 1 Liter of 10wt oil for these springs. See options at the bottom of this page to order oil. 

Please note:

10 wt is considered a good starting point for this non-adjustable fork. Once you determine which side is compression and which is rebound you can alter the viscosity to suit conditions and preferences.

Air chamber is 160mm with springs removed and forks completely compressed. 

Instructions for setting air chamber:  

1) Remove fork spring and drain old oil. 

2) Compress fork fully with spring removed.

3)  Add oil until oil level is the prescribed distance from the top of the tube - this is your air chamber.
Piston rods should be pumped several times to dispel any remaining air before final measurement is made.