"ItalianItalian bicycles are built to specific standards of threading and dimensions. Most parts on Italian-dimensioned bicycles are interchangeable with
British/
ISO dimensioned parts.The major exception is the
bottom bracket. Italian
bottom brackets are 70 mm wide, as opposed to the usual 68 mm dimension of British/ISO and
French bottom brackets. The cup diameter is also larger. Sometimes, bicycles which have damaged bottom-bracket threads are machined out to Italian size to eliminate the damaged threads. Italian bottom brackets, like the
French, use a right-hand thread on both sides, so the
fixed cup is prone to loosening up unless very securely tightened or secured with
threadlock compound." -sheldon brown
thought this was important. But it begs the question can you convert english bb into italian by re-threading the bb ? if so what tool would you use?