So despite having had my BB shells retapped to other standards (Italian/English etc) 2 or 3 times before, my new LBS, Cycle Junxion, have told me it is not possible to retap BB threads. I need to retap a French threaded BB shell to English thread on Saturday. Anyone got the gear or a shop nearby that will do it?
How did they manage that before? Given that the drive-side thread needs to be reversed I'd assume that some metal needs to be run into the shell to give the tap something to cut into. Sounds like a job for a framebuilder more than an LBS.
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