Join Date: Aug 2005
Location: Pittsburgh, PA
Bikes: '''96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '12 Surly Pacer, All are 3x8,9 or 10. It is hilly around here!
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Have the threads in the bottom bracket shell "chased" with the proper tap. I expect the threads were slightly warped when the frame was brazed and the maker didn't clean them up afterward or there is some overspray from the paint that wasn't removed.
The probability that the Shimano bb threads are defective is remote and Shimano italian threads will be compatible with any properly threaded Italian bb shell.