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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
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2 Answers 2

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 will also probably have to change you spacing, and 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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