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That's interesting. What size tires do you have on the 17's and 18's? I've got a set of 17's and a set of 18's for my 2003 S and the speedometer is off about the same with either set on the car. My tires are all Michelins in the OEM sizes, 205/50-17 and 255/40-17 and 225/40-18 and 265/35-18. And even with the same nominal tire size, the actual height and width of tires will vary by manufacturer.
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Current: 2022 718 Cayman GT4, PDK bone stock (the dark side).
Former: 2003 S, 3.6 LN Nickies, ARP rod bolts, under-drive pulley, Fabspeed sport headers, Softronic tune, 987 airbox 987 motor mount, Function-First Sport motor mount insert, Ben's short shifter, Nine8Six projector headlights & center caps, ROW M030, stainless flexible brake lines, B-K rollbar extension & fire extinguisher mount, hardtop
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