Thread: Non-Standard BB Shell?
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Old 03-14-23, 09:42 AM
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JohnDThompson 
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Originally Posted by VtwinVince
I recently picked up an '85 (I think) Rocky Mountain Giro road bike which I've taken apart. When I went to install a different BB, I found that the diameter of this shell was slightly bigger than normal. I've never seen this before. Has anyone had a similar experience?
What is the inside diameter of the shell? Are there any markings on the bottom bracket cups or cartridge that would indicate thread spec? Italian thread is 36mm x 24tpi; English thread is slightly smaller at 1.37" (34.8mm) x 24tpi.
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