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Originally Posted by texomawaves
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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I have the same exact problem only my PZeroes are on the stock 16" wheels. Seems it has to be something with the tire, perhaps the very low profile? I'm curious for an answer as well because not only does my GPS indicate a 5 mph difference but so does everyone of those speed warning devices I go through.