Bike Forums - View Single Post - BB spindle length... What do I need?

10-11-11 | 08:19 PM

#14

bigbossman

Dolce far niente

Joined: Dec 2004

Posts: 10,710

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From: Southwest Idaho

Quote:

Originally Posted by RobbieTunes

I'm glad you enjoyed that.
Now, what about the shell diameter? If I recall, my English bb cups will sit right inside the Italian shells....
Maybe I'm wrong again, but in addition to the opposite threading, are not the cups of a different diameter?

Yes, also different diameters. Look at the chart, son... look at the chart:

http://en.wikipedia.org/wiki/Bottom_bracket

SO/English or BSA 1.37 in x 24 TPI Cup Outside Diameter 34.6-34.9mm Left-hand thread drive side
Shell width 68 mm

Italian 36 mm x 24 TPI Cup Outside Diameter 35.6-35.9mm Right-hand thread both sides
Shell width 70 mm

French 35 mm x 1 mm Cup Outside Diameter 34.6-34.9mm Right-hand thread both sides
Shell width 68

Swiss (very rare) 35 mm x 1 mm Cup Outside Diameter 34.6-34.9mm Left-hand thread drive side
Shell width 68

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Last edited by bigbossman; 10-11-11 at 08:23 PM.

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