Not necessarily, it is the rotating mass that is key, and the wheel generally weighs a hell of a lot more than the tire...
Ok, I see your point. Those rims must be heavy fockers then. I used to run some 38" swampers and on a 15" rim that was a very heavy set up. I just could not fathom a 24" bling rim with a rubber strip weighing more. But I guess I could be wrong.