I was assembling a mountain bike today, (Schwinn Homegrown) and found that when I shifted into my small chainring up front the chain would rub the tire and the FD cage was almost touching the tire, which was only a 2.1 by the way.
I had a 5mm spacer laying around and put it between the drive side BB cartridge and the frame then tightened it all up. Just rolling around the back yard it seems OK. I know the proper way to fix this would be to buy a wider BB cartridge but this one is almost brand new. Its a 118 width. Does anybody think this will cause a problem.