Problem Solvers Micro Adjustable Headset Spacer. 12mm Height

The Problem Solvers adjustable spacer installs between the stem and headset to adjust bearing preload. Requires a minimum of 10mm stack height below stem Installs between stem and headset to adjust headset preload Use instead of star nut or preload compression plug; ideal for carbon steerers Great for custom fitting where you need to fine-tune the stack height before cutting the steerer tube or installing a star nut