These are the ultra-low-profile dust covers we developed for the Alpha X and Sigma X front ends. They replace the standard dust cap on your bike, allowing up to 30mm of stack reduction and a much cleaner look. Aerodynamically, it's usually preferable to slam your stem and achieve your pad stack via the use of aerobar pad spacers.
Now you can slam your stem all the way to the headset, safely and easily. These Dust Covers fit most 1-1/8" headsets will fit 1-1/4". Each one is 1mm thick and individually machined from T6-6061 aircraft-grade aluminum, media-blasted for a beautiful satin finish, hard anodized, and laser-etched with the TriRig logo. Each one includes four 0.25mm stainless steel micro-shims for spacing upwards if needed to clear your particular headset.
Outer diameter: 47mm
Inner diameter: 29.10mm
No returns on Dust Covers.