Question about 2002 BMW M5

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2001 bmw m5. Speedometer reads 60mph, but actually doing 55. Tires new & correct size. Rear gear stock. Any help would be appreciated, Thanks.

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All vehicles with speedometers (except specially callibrated Police ones) will always read up to +10%,so yours is a perfectly acceptable reading.

Posted on Nov 19, 2010


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My Speedometer reads faster than than actual speed and the reading to actually increases ex at 20 mph it reads 28 mph and at 55 mph it reads 80 mph. How can I correct this?

Do you have any codes ? Have you modified your steering/suspension in any way ? Have you changed the size of your tires ? If you can share more detail information, this would help

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My car tires were the standard size P185 65 R14. They were recently changed to P185 60 R15. Will this cause any problems on this car?

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Speedometer registers lower speed than car is actually check engine light. dealer says can't diagnose without light

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Correct Tire Size?

Your speedometer would be incorrect and your ABS brake function would change slightly, it would activate at a lower speed. Fuel economy would suffer slightly at highway speeds.
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1 Answer

Speedometer appears to register 15 miles less than actual speed

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