This spacer is necessary if you need to fit an 8-10sp cassette onto an 11sp hub. You will need appropriate tools to remove and refit the cassette, such as a chain whip, cassette lockring tool, and a large wrench.
3mm Aluminium Cassette Spacer - 7 Speed Cassette on 8/9 Body, Fits Shimano
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AOTISBAO 3 Pcs Bicycle Freewheel Washer Cassette Lightweight Aluminium Alloy Bracket Axle Hub Spacer for Bicycle Road Bike Mountain Bike
High Precision Aluminium Alloy Spacer Set for Bicycle Cassette Flywheel 5pcs
Hope XX1/XD 11 Speed Cassette Aluminium Inc Spacer Gold
(1mm+1.5mm+2mm)Cassette Spacer Kit Bike Flywheel Hub Spacer Bicycle Bottom
