Originally Posted by
Miele Man
...Plus, most sealed cartridge units are symmetric so you get a no-go twofer....
I don't know why they say that an asymmetrical spindle is required. I've always accounted for the difference and picked a modern symmetrical BB with correct chainline and let the left side crank be spaced out a few extra mm.
Originally Posted by
LesterOfPuppets
Have you done that on a bike? Measured how much farther out the chainline is when on a 107mm shimano UN-xx?
The original spindle is 112mm, asymmetrical by 2mm. That translates to a 114mm BB modern symmetrical BB. The difference between the tapers changes things by -1mm so a 113mm BB should do it for a 120mm hub chainline. Adding 5mm for a 130mm cassette hub will yield a 118mm BB.