• Campagnolo experts....

    I've got a 1977 Gran Sport chainset as below, which I'd like to use with a single chainring for Fixed Gear use:

    Does anyone know what bottom bracket I can use to get a 40.5mm chainline (slightly narrower than normal, as the frame has a vintage wheelset on it which needs this). It seems to be a complete minefield out there!

    Thanks

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