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Common BB threading(4 posts)

Common BB threadingBlair
Jan 3, 2002 7:58 PM
I'm interested in determining the threading on my bottom bracket. Is there a good way to determine between english and italian threading? Is one a more common standard? Is there a standard within brands or frame materials? The bike is a mid 1990's Bianchi TSX lugged steel.

Thanks, Blair
re: Common BB threadinggtx
Jan 3, 2002 9:40 PM
I'm guessing yours is Italian. Italian bb shells are 70mm (vs 68) and the drive side cup is right hand thread (vs left). More info here:

http://www.sheldonbrown.com/gloss_bo-z.html#bottom

http://www.sheldonbrown.com/gloss_i-l.html#italian
Look for markingsKerry Irons
Jan 4, 2002 4:36 PM
Most BBs I've worked on have had some sort of marking on them telling what the threading was (English is 1.370 x 24, Italian is 36 x 24). Look carefully at both sides on the faces of the cups and along the edges. Bianchi would most likely be Italian, but . . .
Bianchi TSX BBDuke249
Jan 29, 2002 7:34 AM
Strangely enough, this frame uses an English bottom bracket. I bought one of these frames used for my fiance awhile back and had to replace the BB. I was baffled why it doesn't have an Italian BB.