Initially I put a 118mm BB on my bike because I needed a triple. I have since graduated to a just using the 53/39 and removing the 30.
I have a long cage rear d for the triple, but I would like to go down to a short cage if I could.
I have read articles from people that use short cages on triples and they limit the amount of cross chain so that the rear d will shift. So for setting the maximum throw you would put the chain on the 53 and 23/24 or one down from the biggest rear cog. This would then prevent the rear d from shifting to places that it cannot handle due to maximum chain wrap.
This makes sense, but can this be done with a 118mm BB? My fear is that the chain line will be all screwy.
On a similar note can I adjust the front d to not shift to the inside most gear by adjusting the limit screws?