A little help with weight please...Boss vs. stocker 18's

[oldschool]

Just curious if anyone has ideas. I don't drag but around town I was wondering how much weight my maggie gains per wheel witht he following setup over stock 18's

Boss 326 on 275/40/20 vs stock 225/60/18.

Can't find weights anywhere...hmmm

[R/T Stunna']

My rims (22 inch 335 boss) without the tire are at about 45lbs each. I would assume the 326 in the 20 inch would be around 30-35 per wheel.