No Techstream Tire Size Adjustment
#1
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So I was looking into going with a 245/45/18 on the SC. I was surprised to learn that you cannot adjust the speedometer via techstream to accommodate a different size tire other than came OEM? Even back in 1999 on our Ford F350 Dully when we went from a 205/?/16 to a 235/?/16 the Ford Tech hooked up the laptop and changed the tire size so the speedometer was correct.
Dennis
Dennis
#2
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Funny you mention this. The speedo read high with the 40’s exactly correct with the 45’s.
#3
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Calflashbob
Really given the car came with 245/40/18's I would have thought it would have been spot on with OEM tires.
Dennis
Really given the car came with 245/40/18's I would have thought it would have been spot on with OEM tires.
Dennis
#4
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That is interesting. Mine also reads a little high on stock. Can't wait to get rid of these run flats. I did something similar to my old LS400 with a larger sidewall than stock and the same thing happened. Speedometer was more accurate with the slight oversize.
Last edited by Lavrishevo; 07-30-19 at 07:33 AM.
#5
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i have a set of 19”s to put on when the 18’s wear out and may go slight oversized to correct it also
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