Originally Posted by
lil brown bat
I use it to loosen up sticky hinges when I need to take a door off its hinges. It's also good for certain types of window hardware and sticky door locks. I don't use it on a bicycle.
A bike mechanic that I know who has been in the business for 40+ years once told me to never use WD-40 on a bike, especially the chain. I've followed his advice.