Could it actually be a 70mm bb, wouldn't think so by 89 however it may be possible and may or may not help explain your dilemma. Do you have a cup and cone bb to try in it just to see? I would also scrutinize the bb with the calipers if they are deep enough to go across both sides, check several different axises, may not be square but might be 70mm. I would make thread chaser out of an expendable cup if you have one, clean the threads with a right angle pick and then carefully run the chaser to see what happens.
Originally Posted by
Spaghetti Legs
It’s a Campy Chorus 102mm cartridge. Same as used in the 10s group.Threads are in good shape, the shell measures 70.0* with my calipers, so I figure the faces must be out of parallel a fair amount. I guess another solution would be a Phil Wood BB.
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qcpmsame - That little bit of oxidation is the only rust I could see in the whole frame. Don’t worry, I sprayed it with Boeshield since taking the pic.