Description
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.
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