Buffing pads are available in all sorts of diameters. Other than the obvious size discrepancy, expect to see a change in polishing performance as you outfit your machine with small or large diameter pads.
When choosing any pad, keep in mind that in comparison to a large pad, a small pad offers:
• Less total surface area
• A decrease in edge speed for any given RPM
• A concentration of applied pressure and polishing force
I am currently working on a page that delves into the subject. Until then, take a look at the charts below. They show linear speed and surface area comparisons related to using small and large pads: