Thread: Non-Standard BB Shell?
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Old 03-15-23 | 09:39 AM
  #9  
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alcjphil
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From: Montreal, Quebec
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?
When you removed the old bottom bracket was the cup right hand threaded on the drive side? If so, along with the shell being too big for the replacement cups you would have a good indication that the shell is Italian threaded
Last edited by alcjphil; 03-15-23 at 05:03 PM.
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