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I think these cars call for 195/65 for 15 inch rims. I got 195/60's on the front and the speedometer reads exactly 10% faster. I know how fast I'm going by taking the speed readout on the guage and subtracting the value of whatever the tens digit is to get my real speed. I figured it out timing distance markers on the highway and doing the math.
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1987 silver 924S made it to 225k mi! Sent to the big garage in the sky
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