Thread: Non-Standard BB Shell?
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Old 03-14-23 | 09:45 AM
  #7  
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JohnDThompson
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From: Appleton WI

Bikes: Several, mostly not name brands.

Originally Posted by Germany_chris
Some mountain bike BB shells are 73mm vs the 70mm IT or 68mm BSA
And some Japanese built, English thread frames have 70mm shells, and some Italian made, Italian thread frames have 65mm shells. Bottom line: shell width is an unreliable indicator of thread spec.
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