Originally Posted by
MilhouseJ
How capable are you with bike maintenance stuff? Do you have any experience with removing a bottom bracket? You can find new ones in many different lengths (widths?). Keep in mind that any increased spindle length is cut in half, so get a measurement of the distance you're short with your current BB, pull it and find the spindle length on the body of the BB (should be on the shell between the bearings, or just measure the one you have), and get the next suitable size up.
If you're 4mm short in derailleur throw, get a BB with a 10mm longer spindle.
(Scratches head) If he puts in a longer spindle, the chairings move further out. The big is already out beyond the FD reach. OP needs a shorter spindle and needs to check that the inside chairing doesn't hit the chainstay or the crank the BB after the switch.