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
@le_james started
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Thanks everyone.
The 8010 is an XT mountain bike hub. Does that already have the spacer built in?