My experience with a Superbe bb is that the axle is longer on the chain ring side. The Shimano UN-series sealed bb I replaced it with was NOT longer on the chain ring side, therefore the chain ring ended up closer to the frame. If you are using a Shimano unit, that could be your problem.
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My C&V Bikes:
1972 Bottecchia Professional, 1972 Legnano Olympiade Record,
1982 Colnago Super, 1987 Bottecchia Team C-Record,
1988 Pinarello Montello, 1990 Masi Nuova Strada Super Record,
1995 Bianchi Campione d'Italia, 1995 DeBernardi Thron