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      12-03-2012, 02:43 PM   #5
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Drives: Audi A4 3.2; Porsche Macan S
Join Date: Feb 2011
Location: Chicago

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European cars tend to exaggerate speed slightly. Up until the moment you learned that, you thought you were an undefeated speed demon.

Tire pressures and rim size have a negligible effect on speedo readout. The engineers build this cushion in so that even if there are variables out of your control, there's no way you can sue the company for an inaccurate speedometer.

Make sure when swapping for winter that you buy rims and tires with a total rolling radius equal to factory spec.
2001 Audi A6 Allroad 2.7T (C5); 2005 Audi A6 4.2 Quattro (C6); 2005 BMW X5 4.4i (E53); 2008 BMW 535xi Sports Wagon (E61); 2011 BMW X3 xDrive35i (F25); 2009 Audi A4 3.2 Quattro Prestige (B8); 2015 Porsche Macan S (October 2014 delivery)
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