The 120 relates to the width of the rear hub, so not really relevant here.
Yes, measure current axle width and go from there. It does work as long as you have the correct length, I have done the opposite to you and used an older BB with a modern crankset.
The 120 relates to the width of the rear hub, so not really relevant here.
Yes, measure current axle width and go from there. It does work as long as you have the correct length, I have done the opposite to you and used an older BB with a modern crankset.