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I read that unless you increase the weight towards the outer edges of the wheels/tires it doesn't have a great effect on that "rotational mass" mumbo jumbo.. Sorry I'm not trying to be ignorant but I don't remember word for word what i read.. It was a test where they switched from 14's or 15's to 17's and saw a 3% loss in HP of course that's goin up 2" so I would assume going up an inch would be roughly a 1.5% loss in HP depending on the wheel style and weight..
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