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Tire Size Impact on PSM/ABT

Wheels and Tires

Model: Cayman S, Year:2006, Mileage:15000, Type of use:Both Street & Track
I want to replace the standard rear sized tire (265/40-18) with a 275/35-18 track tire, which has a diameter difference of 2.93% (smaller). Fronts will have a only a very small difference. Will PSM or ABT be adversely affected by a difference of this magnitude on the track? What about the speedometer?Thanks,Cliff R.

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