Originally Posted by
John E
The advice regarding fixed cup threading is backward. One removes a (left-threaded) English or Swiss fixed cup by turning it in the [b]same[b/] direction as one pedals the bicycle forward. One removes a right-threaded French or Italian fixed cup by turning it anticlockwise, as in backpedaling.
Data point: my 1980 PKN-10 was definitely Swiss-threaded, and the fixed cup was gold colored. I forced in an aluminum English-threaded fixed cup about 10 years ago when I converted to a triple chainring and Sugino crankset, and it has worked fine. At 34.925mm, the 1-3/8" English cup diameter is actually a tad smaller than the French/Swiss 35mm size.
Guys, thanks for the compliments.
John, you are correct, Swiss and English cups are removed my turning in the same direction the crankarms move while pedaling . There's a few typos I need to fix!!! I remember installing English BB's in Swiss threads and yes, it does work. I'd say 1 out of 10 I did were failures and for those I'd have to try a few different cups until I got one to fit tight.
I have alot more info to add to the site as well as catalog scans from 1901 throught 2003. Obviously I dont have all of them but I've have from 1960-2003 covered with only a few gaps.
If anyone has anything they'd like to contribute feel free.