Should have a 1mm spacer assuming it's a 9/10 speed hub.
9/10 speed freehub:
9 speed cassette, no spacer 10 speed cassette, 1mm spacer
9/10/11 speed freehub:
9 speed cassette, 1.8mm spacer 10 speed cassette, 2.8mm spacer 11 speed cassette, no spacer
Makes sense, thanks.
@Lolo started
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Should have a 1mm spacer assuming it's a 9/10 speed hub.
9/10 speed freehub:
9 speed cassette, no spacer
10 speed cassette, 1mm spacer
9/10/11 speed freehub:
9 speed cassette, 1.8mm spacer
10 speed cassette, 2.8mm spacer
11 speed cassette, no spacer