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your really doing 40. I know that what mine did when I went from 15 to 17.
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What size did you go to in tire..? I went from 15's to 17's..with a 205/40/17...and my speedo shows to be maybe 1 mph off..(tested by Phoenix Police roadside speed wagons). If you went with a 45 series.then you will be off a lil more