I've read all that stuff too. Maybe you don't understand I'm considering the weight of everything (dissimilar material weights). What I read was a broad statement.....
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I've done the 20's thing... My acceleration and brakes were sacrificed in the process for a 'look'....
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Two wheels of the same materials & design but w/different diameters? Yes, I agree w/the rotational mass being greater w/o question. But, change the materials & design of each adding the weight of the tires sidewall into the equation & that statement warrants challange before assuming it's 100% correct.
Again, I agree w/your statement when it's an apples to apples comparison (15x8" steelies vs. 20x8" steelies). But if the materials are different (15x8" steelie vs. 20x8" aluminum wheel) there is a mathmatical difference. To me that has to be calculated & not just assumed.