Lets see... 20 wheels, available from 18" to 22" dia, widths from 8" up to at least 10.5 (for the brave), that's 20x5x6=600.
Dang Craig, you better get busy, you've got 600 boxes to open! ...oh wait, I forgot to include the different finishes. A plain wheel would weigh significantly less than a powder coated wheel...
For those that are truly interested, I will be weighing mine when they arrive and will post weights on new and old. Unfortunately these weighs will be with my digital bathroom scale and will probably not be considered very accurate to all the engineers in the crowd.