I don't have a problem but I have a trick that I thought people should know about
My hamsters wheel used to squeak really bad at the joint at the back. Normally, squeaky joints would use oil, but I thought that sunflower oil would be a more hamster friendly solution
and it worked! it really stops the squeaking
so if you have a super squeaky wheel, just pour sunflower oil into the back of the wheel and then wipe as much of the oil off of the external bits as you can so your hammy can have access to as little as possible
hope this helps!!