You need a 1mm spacer to use most Shimano 10-speed cassettes on Shimano 8/9/10-speed hubs. You need an additional 1.85mm spacer to use Shimano 10-speed cassettes on Shimano 11-speed hubs.
@gbj_tester started
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You need a 1mm spacer to use most Shimano 10-speed cassettes on Shimano 8/9/10-speed hubs. You need an additional 1.85mm spacer to use Shimano 10-speed cassettes on Shimano 11-speed hubs.