Originally Posted by
sageo3000
I currently have a 68mm traditional 3 piece cup and cone bottom bracket.
if the cups tighten like british/iso (left side tightens right, right side tightens left) style bottom brackets, does it necessarily mean that the thread sizing is that of a british/iso style bottom bracket (1.370" X 24 tpi)?
No. Especially if the bike is old enough to have cotters. If it's a Raleigh, you could have 1 3/8" X 26 tpi threading, in which case the only sealed BB that fits is a Phil Wood. (See
http://www.sheldonbrown.com/cribshee...mbrackets.html ) If the bike's Japanese, it's almost certainly English threading.