Wilbers Zero Friction Linear Fork Springs 8.5N/mm / S1000XR '15-'19

Please note:

5wt oil is recommended for sport-oriented street riding.

Air chamber is 110mm 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.