Originally Posted by
Jeff Wills
I'm 99% certain that I never saw a Swiss-threaded Shimano bottom bracket. Even finding a French threaded one was tough in the '80's and your chances diminished as "French" bicycles were increasingly made in Taiwan.
The way to check is by looking at the fixed cup. If French thread, it'll be right-hand threaded (and prone to working loose). If really Swiss thread, the fixed cup will be left-hand threaded.
Exactly why I started the thread. I had never seen one and had to take a leap of faith on buying as the seller was unsure if it was left hand thread (please let us shorten this now to LHT and RHT! Lol). No SI marking, but a CH and L. Is the CH a date code or indicator of Swiss? Does the L mean left?
As I have a Motobecane soft spot I am always looking out for a “spare” and I think I am not the only one here….A picture data base of the cups would be very helpful when deciding to press the buy it now option….