Here's the weight I got when I had them
18 x 8.5 Imagine with 235/40/18 Bridgestone SO3 tire 58 - 59 lbs.
The SO3 tire is supposed to weigh 26 lbs per bridgestones website so that would put the 18" Imagine wheel at 32 to 33 lbs.
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18 x 8.5 HM2 with 235/40/18 Nitto tire - 49 to 50 lbs.
Supposedly, the 18" older HM2 wheel is 24 lbs. and the new polished lip is supposed to be 25 lbs.
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My friend had 19 x 8.5 HM2's with 235/35/19 Dunlop SP9000 and they weighed in at 54 lbs.
I don't know the wheel weight alone for the 19" HM2