Join Date: Jun 2004
Bikes: 1987 Bianchi Campione
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Originally Posted by bassclefjeff84
so I should get a 73mm or a 68mm for the 70mm shell. I would think that 68 would be too small because the left side cup would have to be screwed in 2mm more than usual. So a 73mm would have about 3mm exposed on the left. Or I could put a BB cup spacer on the right fixed side to even it out a bit. right????
You're thinking much too hard.
If you're going to be using a 68 shimano square taper cart, this is a non-issue. The left cup either has a flange (metal) or it doesn't (plastic). If it doesn't have a flange tighten it in and it's fine, if it does and the flange bottoms out on the shell face before securing the bb then you can either
a) grind it off
b) find a metal lipless cup
c) insert 2mm spacer for the driveside
I had a 70mm japanese bianchi with english threads. I found a lipless cup and used it. The last option is to
a) face off 1mm from both sides of the shell
Most bb's hav a +/- 1mm shell width variation tolerance anyways.