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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?

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What brand components are on it now? – M. Converse Aug 25 '10 at 22:37
Currently STX-RC. – futura Aug 25 '10 at 23:00
up vote 2 down vote accepted

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.

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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.

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Won't he need a new chain as well, then? – Jack M. Aug 25 '10 at 22:38

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