OneUp Components

MicroSpline 12-Speed Freehub Body w/12x148mm End Cap

The OneUp Components MicroSpline 12-Speed Freehub Body w/12x148mm End Cap is a direct-fit replacement driver kit for riders running Shimano Micro Spline 12-speed MTB cassettes on compatible OneUp hubs, restoring crisp engagement and reliable cassette retention after wear, contamination, or drivetrain changes.

• Shimano Micro Spline (12-speed) compatibility - Enables use of modern Shimano 12-speed MTB cassettes with the correct spline interface and lockring support
• Boost 12x148mm DS end cap included - Keeps the hub properly spaced for 148mm rear frames and simplifies service with the correct drive-side hardware in the box
• Complete service kit - Includes freehub body, drive-side end cap, and a 1.8mm spacer to streamline driver swaps and cassette setup
• 1.8mm spacer application notes - HG 11sp road freehub bodies require the 1.8mm spacer for Shimano/SRAM 8–11sp HG mountain cassettes; XDR drivers require the 1.8mm spacer for use with XD cassettes