What parts do I need to upgrade my drivetrain? I have a Cannondale M300 with a 7-speed drivetrain.  The parts are fairly worn and I am considering converting to a 9-speed as 7-speed components are getting harder to find.

What parts do I need to consider to replace the drive-train?
Without knowing the specifics of your setup, you may need to replace:


Chain
Front Shifter
Rear Derailleur
Cassette Hub
Cassette


You may also have to change your dropout spacing, and may need to re-dish the wheel to maintain proper alignment.