So I was sitting up in bed with the laptop reading this thread and I got out of my warm bed and went down to my cold garage just for you guys. This better be worth a damn rep point
I switched over to my summer wheels and tires this past weekend, so the base 18's are off the car. Here's what I found (measured on a postal scale good up to 75 lbs., seems accurate enough).
Rear wheel with tire, balancing weights, valve stem and powdercoat weighed 50.9 lbs. The tire weighs about 29 lbs. (according to the interwebs), the weights and valve stem a few ounces, and the powdercoat - I have no idea but I'll guess between 1/2 lb. to 1 lb. That would make the rear wheel about 20.5 to 21 lbs.
Front wheel with tire, weights, valve stem and PC weighed 49.25 lbs. The smaller front tire weighs 27 lbs, so the net weight of the rim would be about the same as the rear.
I'm getting the tires dismounted in a few weeks to get two of the rims PC redone (damn carwash guide rails), I'll weigh the rims by themselves to prove or disprove some of this guesswork and will let you guys know.
And yep, they're enkeis...