Originally Posted by
San_Son
I have a Torrot with a Zeus BB. I've checked the cups with a pitch gauge and they fit in the metric system part in the 1mm gauge so they are 35mm x 1 mm. The funny part is that the fixed cup is left-handed. This means I have an spanish bike with a suisse BB? I´ve been digging in old Zeus catalogues and it seems Zeus did french, british ans italian standards but not suisse. Any idea? This really wierd or I´m missing something?
You got yourself metric
SWISS threading going on with that Torrot frame, nothing French about the bb threads.
Yeah, still metric, but with superior left-hand threading on the driveside.
The frame maker either ordered the bb shells with Swiss threads, or with no threads (and tapped them themselves).
I've "forced" an English-threaded BB-UN72 bottom bracket into a 1979 Peugeot's Swiss-threaded frame, but it took considerable back-and-forth action with a long wrench to work it in fully (the cups being aluminum, no alteration to the frame's BB actually occurred).
I don't think that it would have worked using a bottom bracket having only holes for a pin tool instead of robust splines like the Shimano BB.