• Thanks everyone.

    The 8010 is an XT mountain bike hub. Does that already have the spacer built in?

  • MTB hubs have the same spline pattern but are narrower so do not require the spacer (unless you are fitting 8 speed or something like that)

  • If you're running an 11spd MTB cassette on an 11spd MTB freehub body, you don't need the spacer.

    It's only for MTB -> Road hubs

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