You can use the Shimano free hub with either 10 or 11 speed, if you want to use 10 speed then you have to use the included spacer. I've been using it with the Campag free hub on an 11 speed Athena cassette.
@Palbay started
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You can use the Shimano free hub with either 10 or 11 speed, if you want to use 10 speed then you have to use the included spacer. I've been using it with the Campag free hub on an 11 speed Athena cassette.