These SRAM X0 rear hub conversion caps adapt your hub for 12x135mm or 12x150mm through-axle frames, covering both trail and downhill frame standards under the X0 and X0 DH platform. The 12x150mm standard is common on dedicated downhill bikes, offering maximum rear axle stiffness for the high-impact demands of gravity riding.

Swapping between these standards is simple — SRAM's threadless cap design requires no tools and takes only moments. Having the correct caps for your specific frame ensures the axle seats properly in the dropout, eliminating any play in the rear wheel and maintaining the precise alignment that hub bearings depend on for a long service life.

SRAM part number: 00.1918.145.012

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