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?

  • What brand components are on it now? Aug 25, 2010 at 22:37
  • Currently STX-RC.
    – futura
    Aug 25, 2010 at 23:00

2 Answers 2


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.


Been a long time since I did my 7 - 9 conversion but I believe I needed:

  1. new cassette
  2. shifter for rear
  3. new cassette mount thing (not the hub but I'm blanking on the name)

You may also need a new front shifter since a 9 speed chain is thinner but I managed to make both front and rear work just fine. I squeezed the front one down a bit to make it a bit narrower. Been using mine for 7 years or so now.

  • 1
    Won't he need a new chain as well, then?
    – Jack M.
    Aug 25, 2010 at 22:38

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.