Problem Solvers Micro Adjustable Headset Spacer - For 1-1/8" Steer Tubes 10mm Min 12mm Max Height

The Problem Solvers adjustable spacer installs between the stem and headset to adjust bearing preload.For use with 1-1/8" steerer tubesInstalls between stem and headset to adjust headset preloadUse instead of star nut or preload compression plug; ideal for carbon steerersRequires a minimum of 10mm stack height below stem