That's Campag... Different from Shimano spacing!
Yes, sorry it wasn't very clear in my first post. The wheel i want to fit it to is a campag, fulcrum wheel.
You mentioned you tested with a Shimano cassette and it is OK right?
Campag and Shimano have different spacing and MAYBE that's why the former won't fit.
@inkleined started
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That's Campag... Different from Shimano spacing!