Is there a trick to painting wheels while they're on the car or is it preferred to dismount the tire from them?

I have a Diplomat ex cop car that is white with the police slotted wheels and dog dishes. The wheels are black and I would like to repaint them white but don't really want to go through the hassle of pulling the tires off, taking them somewhere to dismount etc etc.

Is it ok to use just a regular spray paint like Krylon or something similar with a clear coat or is that going too far?

Thanks for any info.