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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1 Answer

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?


Original tire
Sidewall: 4.73 in
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Speedometer reading with new tire is 1.16% too slow.
When your speedometer is reading 60mph you are actually traveling 60.69mph.

Sep 18, 2011 | 2001 Plymouth Neon

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2003 GMC Yukon speedometer indicates less than actual speed by 30% - 60%.


Do you have after market tires that are larger than stock ? This will affect your speedometer.Another thing could be the speedometer gear which is easy and cheap. Its at the end of your speedometer cable inside of transfer case.

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I have a 92 GMC stepside and its lifted about 4.5 inches. I think its making my speedomiter be off. It says im going 50mph when i feel like im going 20mph. It also has a rebuilt motor and transmision....


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Speedometer registers lower speed than car is actually traveling.no check engine light. dealer says can't diagnose without light


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1 Answer

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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Regards,

Apr 21, 2009 | 2004 GMC Envoy

1 Answer

Speedometer appears to register 15 miles less than actual speed


If you have replaced your stock size tires with oversize aftermarket tires and wheels (17 inch stock wheels to 22 inch wheels, etc) you need to have the computer reflashed to compensate for the larger tire size. Larger tires turn slower to maintain the same groundspeed, giving a false speed reading.

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