Authentic AEcreative spacer sold by AEcreative. Shimano Campagnolo 7 8 9 10 11 speed cassette freehub conversion, buttom bracket BB adjustment. fit 10 speed cassette to 11 freehub, fit 7, 8, 9 speed cassette to 10 11 speed freehub, fit 7 speed cassette to 8, 9 speed freehub. fit BB bottom bracket adjustment spacer.
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