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These spacers are required when installing SHIMANO 11s free bodies with 11s or smaller sprockets.
Use the 1.85mm spacer when installing MTB 11s cassette sprocket to ROAD 11s free body.
[SPEC]
11s to 10s: 1.0mm spacer
11s to 9, 8, 7, 6s: 1.85mm spacer