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		986 Forum - The Community for Porsche Boxster & Cayman Owners > Porsche Boxster & Cayman Forums > Performance and Technical Chat
inaccurate speedometer

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09-21-2009, 06:41 AM	#1
texomawaves Registered User Join Date: Sep 2009 Location: Tx Posts: 259	inaccurate speedometer My GPS says I'm doing 70, but my Boxster says I'm doing 75 (5 mph difference). Is there a way to have it calibrated? The tires are Pirelli Pzero 205/50 ZR-17 on the front, and 255/40 ZR-17 on the back. I feel pretty sure these rims are original stock 17 inch.

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