I have a 89 3.0 cannondale that currently has a shimano 105 52/42 double. I am now living in Italy and riding Mountains and need a lower gear. I am going to buy a triple crank 52/42/30, probably a stronglight or similar (something that won't break the bank). I know I'll need a new BB, but not sure which one. obviously english 68mm, but what about width?? How do you determine which width you need?