wheel AND tire weights

ok. well it just dawned on me. my rims are fucking heavy as shit now that they are mounted to tires. a whole 40lbs heavy!!! yea, my rims may only be 20lbs alone. but today i weighed myself on a scale. the scale read 182. i tried again. same. 182. so i got on the scale with the rim/tire. 222.5. that makes my rim/tire combination a total of 40.5lbs. my question is, do they make lightweight tires? lol. how much lighter are stock steelies with the 60 or something series bridgestones?