I have recently replaced my caged bearing BB with a Shimano UN-55 square taper. I also replaced my three ring crankset with a compact 34T-50T two ring. In the rear I run a Shimano 13T-26T seven speed cassette.

The old caged bearing spindle measured 127mm so I ordered Shimano's 127 UN-55. It installed great and everything in the drive train seems to be getting along well.

Now I would like to move the 50T chain ring more inboard. It is now at 56mm from the center of the seat tube. This was probably OK with the triple ring crank set, but I live using my 5th, 6th, and 7th rear cogs and would like a better chain line from the 50T chain ring to them.

So, if I replace the 127mm UN-55 with a 113mm UN-55 will the difference spindle length of 14mm be from the right side of the spindle? If so then that would position my 50T chain ring about 42~43mm from the center of my seat tube. This would be great.

Suggestions will be welcomed because I don't want the order several BB's trying to reposition my crankset. Large 'thanks' for advise........

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