Join Date: Nov 2004
Location: Appleton WI
Bikes: Several, mostly not name brands.
Mentioned: 22 Post(s)
Tagged: 0 Thread(s)
Quoted: 345 Post(s)
Is there a problem with the original cups that you can't continue to use them?
As noted above, French thread cartridge bottom brackets are available. But be aware that some Motobecanes from the late 70s and early 80s are actually even more obscure Swiss thread. Swiss thread is 35mm x 1mm like French, but the fixed cup is left hand thread. AFAIK
, there are no modern sources for Swiss thread bottom brackets. If you do find your frame to have Swiss thread, Velo-Orange and some other companies offer threadless bottom bracket cartridges. Personally, I would consider this solution before reaming and tapping your frame to Italian thread.
And BTW, your fork is also likely to be metric 25mm x 1mm thread rather than ISO 1" x 24tpi. If your present headset is not usable, Velo-Orange offers a metric headset as well. Your other option would be to replace the fork with an ISO thread fork to use an ISO headset.