I have finally collected the various bits I need to build my late 70s Medici frame, but find myself with two Italian threaded bottom brackets, neither of which seem to fit properly. Hopefully, I'm just doing something wrong and someone here can steer me in the right direction.

I have an Ofmega bottom bracket I pulled from an early 80s Bianchi. I had my LBS swap it from one frame to the other. When I retrieved it, the mechanic showed me that on the left side, the bevels on the spindle didn't stick out very far from the cup, and to be careful when installing a crank arm that it didn't hit the cup. I left it as it sat because I had other parts to acquire.

While I was acquiring said parts, I came across a Sugino MT-70 bottom bracket and also purchased the necessary wrenches to service the bottom bracket. I tried installing the Sugino bb today, and find myself with the same dilemma. See the two attached pix (apologies for the crappy cell phone shots and the dirt):



These pictures are of the Sugino bb. The clearances with the Ofmega installed are essentially the same. Looks good on the right, not so much on the left. When I measured the two bottom bracket shells, the Bianchi's was about 69.25mm vs the Medici's about 70.25mm. I can't imagine that shaving a fraction of a millimeter from the shell to get it exactly to 70mm will improve matters significantly, and don't believe I should have to shave off a full millimeter. I believe I have the spindle installed correctly (long side to the right).

What are my options? Find a longer spindle? Find thinner cups?

Thx,

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