Based on advice given here, I decided to change a 30t chainring for a 24t to get some lower gears. I just received the chainring, but before I dive into removing the crank and chainring, I have a few questions concerning this Octalink bottom bracket and crank.
1. Do I need any special tools? I can see an allen bolt which looks like 10mm. i can get a wrench at the local hardware store. Anything I should be aware of?
2. I have an old crank removal tool from twenty years ago. will that work or will I have to buy something new? If the latter, what?
3. After the crank is off, I will unbolt the inner chainring and replace with 24t. anything I should be aware of?
4. Will I have to move/adjust the front derailleur or replace it?
There is a tool made by shimano that is used to screw in those self-extractor nuts AND to hold chainring nuts. It makes it a lot easier to work on cranks but you can get by without it.
Self-Extractor Crank Bolt:
If you have and will use the self-extractor function, make sure the nut is screwed all the way into the crank-arm before you start unscrewing the bolt, or else the lack of thread engagement in the arm may strip the self-extractor out of the arm and damage threads on one or the other. When you put it back together, clean and re-grease all the surfaces that will touch inside. Make sure you tighten the self-extractor down all the way (with the washer in between) after you tighten the crank bolt.