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When I went to the Bogarts and metric radials that was the only change that I made. Stock wheels and tires are 42lbs. each and the skinnies are 25lbs. each. A total of 34lbs. less and I dropped 1 tenth and gained 1 MPH.
So I'd say it was about a 3-4 to 1 ratio.
Maybe that's what someone told me. Hey, at least I was close for once.