SRAM 900 / X0 Hub Conversion Caps Rear 12X142mm XD / XD-R Driver, Fits Rise XX, Roam 40, Roam 30 and 2015 Rise 60 wheels
Spacing/Axle: 12x142mm XD or XDR Thru Axle
Color: Black
Right side end cap is marked with the XD logo, that cap is required when making a freehub conversion to XD or XDR on the hubs/wheels listed above. The left side end cap is the same on all freehub versions, but is included in the package.