• My commuter has developed a proper loud squeak, only while pedalling in certain gears. I'm pretty sure I've located it to a very gritty feeling pulley wheel on the (presumably 20 years old?) shimano STX rear derailleur. My questions are: 1.) is servicing / replacing the pulley wheels worth the hassle compared with just replacing the rear mech altogether and 2.) if I replace the pulley wheels, any ideas what parts I'd need? I know I need to get the right number of teeth, but do I also need to get a 7-speed specific pulley wheel, or would something like this be ok? Ta!

  • Make sure to use thread lock on the new pulley wheel bolts. They will otherwise unscrew and then the chain will get all stroppy and trash the rear derailleur. Ask me how I know...

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