HDC-0013 – 36×1.5″ Sealed Aluminum Low Profile Crown Race for Maxhit headsets. At just 2.5mm, this 1.5″ crown race features a slightly lower stack height than standard (3mm) crown races. The low-profile design is great for reducing the reveal between your frame and fork and matches the Maxhit lower bearing perfectly./ppMachined from 6061 T6 aluminum, this crown race features a dual lip seal design that is designed to fit both the Maxhit lower and the most common 1.5″ 36° lower IS headset bearings like ACB 6808.