Join Date: Oct 2009
Bikes: -1973 Motobecane Mirage -197? Velosolex L'Etoile -'71 Raleigh Super Course
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It would take someone with a drill press or, better, a vertical mill to bore out the BB shell to the correct size and cut all new threads. English is considerably bigger than the thread root size of the French BB. This is doable, and has been done, but you'd be far, far ahead buying a Velo-Orange French-thread BB and installing that.