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scultura
@vpCogworks
Aaaand I have found my answer here...
"The 11T Hyperglide cogs also have issues with this freehub. Due to the smaller diameter of the 11T cog, it has a reinforcing flange that prevents the cog from from fully seating on a standard Hyperglide freehub. It is intended for a Hyperglide -C(ompact) freehub with the outer edge of splines being relieved. Still, an 11T Hyperglide cog will work on standard Hyperglide freehub like yours but the entire cassette will sit slightly farther out and require a spacer behind the large cog. This shift may cause clearance issues with the frame stays."
Long story short I have to find another small cog.