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1 comments
I think rebuilding on the Helicomatic is a bad idea. In perfect condition the Helicomatic is noisy, poor-shifting, and of course decades obsolete, not compatible with any modern cassette.
If you're going to widen the rear triangle, you may as well go directly to 130mm and be able to use the most common modern parts without modification, like an 8-speed Shimano cassette.
Also if the Campagnolo hub is French threaded I would not consider reusing it.