I'm gonna build a single speeder around a steel frame with a 70mm Italian BB shell.
I was thinking of using an old 115mm 600EX or 105SC Italian BB, instead of going the sealed cartridge UN54/UN72-3 route.
I'm taking a guess that the rear hub (Miche Primato) and crank (Sugino XD2) call for a chainline that dictates the use of a BB in the 107-110mm range, so using a 115mm spindle the chainline would be at least 2.5mm off to the right side on the chainwheel (maybe as much as 4mm if my 107mm guess is correct).
I was thinking of doing the following, is it worth a try?
a) Using 2 adjustable cups instead of just 1 on the left side as usual.
b) Adjusting both cups to the left side 2.5mm from where they would normaly seat to correct the chainline inwards. The spindle, crankarms and pedals would obviously be moved 2.5mm to the left also, but I can live with this and I actually see some benefit as I usually sit a little on my right buttcheek and not directly over the midline of the saddle.
c) Using loctite on the right side cup to keep it from unthreading (a lockring on the right side will be useless).
Should I try it? Will I be dismounting every 5 miles to adjust the cups? Am I crazy?
I know there's some Miche Italian BBs where both cups are adjustable. Does the right side use glue on the threads to keep it still?