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Bottom Bracket Cup Threading...36x24 F????(3 posts)

Bottom Bracket Cup Threading...36x24 F????alexfr99
Aug 22, 2001 6:50 PM
I am trying to find a lock ring for a b/b cup....my english campy ring seems way too tight. The cup is a campy cup and its marked 36 x24 F. The frame is italian i believe.... Is this an italian b/b thread?....thanks
re: Bottom Bracket Cup Threading...36x24 F????alexfr99
Aug 22, 2001 9:24 PM
never mind...i figured it out.....
For everyone's benefitKerry Irons
Aug 23, 2001 4:40 PM
Since this question has been coming up a lot lately:

English BB = 1.370 x 24 tpi
Italian BB = 36 x 24F
French & Swiss BB = 36 x 1

The first number is the diameter, the second is the thread pitch either in threads per inch (24) or threads per mm (1).