I’m going to powder coat the wheels, so I remove the disk brake rotors. I refurbish the three rotors to remove grunge and get the patina on the disk carriers back to factory condition. I also clean out the holes and sand the disks so the new disk pads will bed in and not get fouled from brake pad grunge baked onto the rotors or the dirt and grunge lodged inside the disk brake rotor holes.
Here are all the details about how I do this work and a short video summarizing the work.
VIDEO: 1983 R100RS Remove-Refurbish-Install Disk Brake Rotors
Here are a couple pictures of before and after.