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@thecycleclinic
Type b1 refers to an older freehub ugo. Type b2 is all novatec make now and that is availanle in 10 speed and 11 speed form. They happen to be interchangable i.e type b2 will fit a hub with a b1 freehub but not the other way around. Also 11 speed freehubs work fine on mtb hubs with a 10 speed freehub. You just. Have to use the spacer that comes with it.