These fit Reynolds... Ar 29, ARx 29, AR 41, AR 41X, AR 58/62, ARx 58/62, Ar 80, AR 80X <- Rim and disc brake

Reynolds TR 249 TRS 249, TR309 TRS 309,

These are ultra easy to swap... Remove the drive side end cap with your fingers, remove the current freehub, install this freehub making sure the 1mm (provided) spacer is between the freehub and the main hub, re-install the end cap and you are done.

These are newer updated and more durable version of the freehub with a wider inner bearing than the original Reynolds freehubs. This is a big imporvement for the longevity of the freehub.

-These freehubs also work on any Stans NEO hubset(completely 100% cross compatible) ad will say neo on the freehub body.