Wheel - Rims vs "Discs" Rotating

[kresty]

Being dense I hadn't realized that the "discs" don't rotate with the rims only when he's turning.  When he's moving forward, the main wheel moves with the "discs" (as do the "rims" in between them). 

D-O Turning

Compared to him starting to move, it's clear that the entire outer edge is moving with the droid, only the center panels remain up and down.

D-O Motion Example B (Stabilized)
Another example of Dios motion.  Thanks to Tony Stockert for grabbing and stabilizing the video

 
And you can tell in this still because the "ring" is blurred from the motion:

Dio Stills From Celebration