My bottom bracket is clicking quite a bit. I understand that it may need re-greasing. I have a crank puller and a bottom bracket tool and I have done this before, but I am not sure if I did it right. Is there a good online description of how to do this (I have shimano style cranks and bb).
- should you release the chain tension first?
- do you need to remove both cranks?
- do you need to clean the BB and completely re-grease it, or just wipe it and add a bit more grease?
- how much grease should there be?
- is it ok just to tighten up the cups, or should you really take the BB out and clean it etc?
- is just tightening the allen bolt in the center of the cranks enough to get the cranks back on?
etc. etc.

any tips appreciated.