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There was an article I read not to long ago that basically said that every pound of unsprung weight equates to apx. 10 lbs overall weight of the car -- i.e. if you cut 3 pounds of weight on your wheels, tires, rotors, etc. then it's like lightening the car 30 pounds, and the reverse is true as well. In my case, I was looking at some forged 16" SSR's that were like 11 pounds each and tires for them were 20, so one wheel tire combo was 31 pounds -- about 4 pounds lighter than stock 15's w/ tires. 4lbs x 4 wheels = 16 lbs unsprung weight, so about 160 lbs of overall weight savings. You'd have to tear quite a bit of crap off the car to save 160 lbs normally, so it's a pretty impressive gain.
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