I have the Moon-brand discs, and a bead of caulk around the inside where the fasteners meet the disc quieted them right down. Prior to that, it sounded like I was dragging around typewriters.
Moon discs are a bit pricey (I paid $130 or so shipped), but they will not fall off, ever. They fit so tight, actually, that I need a clawhammer or crowbar to remove them. Plus, they're aluminum, so they're fairly light. They scratch 'n' dent easily, but do well with a coat of wax every so often.
Interestingly, I originally bought them because they look awesome, but the tiny aero benefit is a plus.
__________________
|