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The stock 20s on the SS weight 30lbs each in the front and 32lbs each in the rear. The 16x8s on my car, from a time when cars were built on a different scale, are 16lbs each. So there's 58lbs right there, all unsprung. Designers have gone stupid.
You're assuming a lot of things about the buying public. The public doesn't care about unsprung weight, they don't care about total weight (except in the context of fuel economy). Most SS buyers won't ever drive their cars anywhere close to the point where unsprung weight matters at all. They want big shiny wheels and an aggressive looking car with a big engine that they can brag about. If you're actually concerned about performance, you aren't going to buy one for those same reasons.
You're assuming a lot of things about the buying public. The public doesn't care about unsprung weight, they don't care about total weight (except in the context of fuel economy). Most SS buyers won't ever drive their cars anywhere close to the point where unsprung weight matters at all. They want big shiny wheels and an aggressive looking car with a big engine that they can brag about. If you're actually concerned about performance, you aren't going to buy one for those same reasons.
It's just sad to me that if you've got $26k and want to buy a new car with good performance, your best option is a car with a solid axle.