I asked about this when I bought my Gus and got no conclusive answers. I really did not get a conclusive answer from Riv either. When I ordered a bunch of components from Riv for my Gus build the answer I got about what BB to get went something like " we will look into it and send you the right one". The one I got does work but the box it came in does not give me the information I seek. Here are my questions. Gus and Susie have 73 shells. Riv does not list 73 bb's for sale. And they suggest which 68mm IRD one to get for your Gus/Susie - 123 width with right side spacer(?). Am I to conclude that 68mm bottom brackets work on a 73mm shell? An Tange bb has become available that is a 68mm with a 122.5 spindle. Will it work on my Gus. What about the drive side spacer? Please excuse my ignorance. I would like to upgrade my bottom bracket and really have no idea what will fit best. I gather a lot of different spindle lengths will work but not ideally?
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