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I get 20.32 lb (and ever so slighty more for my other) 01 Alcoa 17x9.5. These are cleaned to like new, dried, no wheel weights, center cap, or valve stem. (This is my calibrated digital shipping scale.) I haven't ever weighed my rears but will next time the track tires comes off.
My 02-04 Speedlines coming lighter than virtually all the posted weights, they vary to, but between front to rear they come in generally .7-1 lb lighter. (For instance, the rear 18x10.5" Speedlines are almost as light as the front 17x9.5" Alcoa's)
All that to say, in my experience, the 02-04 Speedlines are closer to 3/4-1 lb lighter per wheel than the Alcoa (which is more than the posted specs I've always seemed).
It would be interesting to know what the actual load ratings are for the forged vs spun cast.
The 01's get a (unjustified IMHO) bad rap, and the prices can/do reflect that in the marketplace, but it's a great way to get into the C5Z06 world and for less $$.
The reference source for the rim weights that I quoted were taken from the GM parts dept part listings. ( *Your rim weights may vary. Posted weights from Washington DC or any other state that is not regulated by Federal standards are prohibited)