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English or Italian threading for BB?(8 posts)

English or Italian threading for BB?wookie
Feb 6, 2002 11:48 PM
How can I tell if the bottom bracket is english or italian? I've got a klein that needs a new bb. Thanks.
re: English or Italian threading for BB?Robert
Feb 7, 2002 2:41 AM
I believe Klien's are English, but here's how to tell.

English have standard threads on the non-drive side and reverse (left hand) threads on the drive side. They might also be marked "1.37 x 24". Italians have standard threads on both sides and might be marked "36 x 24".
check the shell widthjs
Feb 7, 2002 5:07 AM
68 or 73? it's prob english, italian are getting few and far between
English or Italian threading for BB unit and BB frame shellCalvin Jones-Park Tool
Feb 7, 2002 7:25 AM
If you are asking about the bearing unit itself, look for markings. English threading (ISO) would have something like: 1.37 x 24, or 1.37 BSC, or just BSC. Italian thread would have 36 x 24. You can also look at the drive side cup, if it is out of the bike. Hold the cup vertically. The threads will slope upward, either left or right. English threads should slope up to the left on the drive side. Italian will slope up to the right.

If you have only the frame, look inside the drive side of the shell. Look again for the shell threads. However, these are the mirror of the external threads. The English drive side shell threads will slope up to the right. The Italian drive side shell threads will slope up to the left.
re: English or Italian threading for BB?wookie
Feb 7, 2002 8:08 AM
Thanks fellas! It looks like it turns in counterclockwise from the drive side, hence English.
Klein is Englishgrzy
Feb 7, 2002 12:57 PM
Always has been, unless you're go all the way back to their original system of using BB bearings pressed directly into the shell.

Pretty much the only people that use Italian threading are the Italians because they're Italian. It's a matter of fierce national pride and their investments in tooling.
wookie - are you in Portland? nmPdxMark
Feb 7, 2002 9:18 AM
wookie - are you in Portland? nmwookie
Feb 8, 2002 1:14 PM
Nope. Bay Area, CA