Size of Pedal Threading on old German Glockenlager? I removed the pedals of a Göricke bike from 1934 or 1935 (according to the bike number). It has a Glockenlager (What is that in English? Bell shaped bottom bracket?) as seen in the picture. The crank threading for the pedals however is quite messed up and I would like to re-cut it. I measured 4 threads at about 4,8mm (or 4,9mm) with an 14,2mm external diameter on the pedals. The diameter is a tipical 9/16 pedal threading, but the thread steapness only results in about 20-21 threads per inch, and not 24. 24 is the normal amount of threads per inch for pedals. 

EDIT: I noticed 20 tpi is normal and not 24 tpi. Therefore it should be a normal threading.

Is this some other threading they used in these days or shall I just cut it with a normal pedal thread cutter? The pedal make is K&amp;B (the logo is in a cloveleaf)
Just try chasing the threads with the normal taps (remember the left side is reverse threaded) then try the pedals. Sometimes just chasing and cleaning will be enough, and what have you got to lose if the threads are already damaged. Some pedals have a longer section of thread than others, certain pedals may work better or contact the intact threads better.

Otherwise there are insert kits that cut a larger diameter hole then insert a brass threaded part that has normal pitch threads on the inside. These kits are expensive and may only be made for aluminium cranks so check that out first.