Dial 911 with the headset spacer will help you get the compression and height of your bar at the right levels.

Used for compatibility issues when:

a. Shim is too small to reach the headset
b. The fork strikes the SCS system so that the compression screw cannot be tightened

Place it on top of your headset on the fork and create the necessary space

Measurements:

Inner diameter 1.10 "(28mm)
Outer diameter 1.38 "(35mm)