dancing james-
Is that possible? Do you have any experience doing this or know of other people who did it? I briefly googled this option but I didn't really find any conclusive evidence. I guess it would be a job for a frame builder or do you reckon bigger bike shops have the neccessary tools? Thanks in advance!
p.s. the difference in shell width (fr 68mm/ita 70mm) might be a problem, too. -
Or retap it to Italian thread?
It's not a retap, the diameter is substantially different and so is the pitch. To convert French to Italian, you first have to bore out the shell to 35mm (and I mean bore, its more material than you'd want to remove with a reamer), then cut new 36mm Italian threads. I'd be surprised if a bike shop had the necessary equipment, but the first part shouldn't be too hard for any machine shop with a modestly sized manual vertical mill of the Bridgeport pattern. Success is contingent on having enough wall thickness in the shell to leave it in a safe condition after increasing the bore by 1mm. Once you're past that, it is as others have said a simple matter of adding a 1mm spacer each side and Robert is your father's brother.
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Sig_Arlecchino
gbj_tester
The other option is to throw the frame in a skip, where anything French-threaded belongs :)