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Calibrate speedometer for oversized tires - 2000 Chevrolet Silverado

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Hello, my name is Ben. The only way to re-calibrate your vehicle's speedometer is to have the Powertrain Control Module (PCM) re-calibrated, either by a GM dealer or someone who has the capability to connect with the PCM and change the settings. Several companies sell units that are supposed to be able to re-calibrate the PCM, I have never used one but if you buy from a reputable company it is probably okay. SuperChips has one they call a TirePaq, but they are vehicle specific, and more expensive than a dealer. I suppose it depends on how much you like gadgets. I hope I have answered your question, sorry there isn't a cheaper way.

Posted on Jun 04, 2010


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The police officer said I was going faster than what my speedometer was saying I was doing.

Did you have stock size tires before and change it to a larger or smaller size? The change in tire size can alter the speedometer readings. Check out this website for tire size speed calibrations -

Aug 20, 2013 | 2005 Jeep Grand Cherokee

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Speedometer is 10mph off . if it says 50 the truck is only going 40

Your tire size is likely not the original tire size for that vehicle (likely larger than original). Take it to a shop and have them re calibrate the speedometer.

Apr 06, 2013 | Cars & Trucks

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What size tire 4 1998

Hello, I want to recommend a site for its information. You do not have to buy a tire from them, but the information is good. There can be optional size rims for this Year and it came with 16" and 17" Rims. Go to and enter your vehicle in the appropriate window and the display will show you what your Expedition may have on it.

The site can be adjusted to find tires for any Season, can show you oversize tires that are possible, and what speedometer error a different oversize tire may have on your Vehicle. I believe yours may be 265/70/ R17's.

I hope my solution is very helpful to you.

Apr 18, 2011 | 1998 Ford Expedition

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1998 frontier 5-speed, speedometer is not accurate and jumps forward. Cannot know how fast I am going.

Possible former ownner put oversized (for ground clearence since there is vary little) or smaller tires for more pulling power. Check your ownners manual or call any tire shop and they can tell you what size belongs, this is the most common couse.

Jan 05, 2011 | 1999 Nissan Frontier

4 Answers

Do oversized tires alter the speedometer. The speedometer stated i was going 65 and the state police clocked me at 79 mph.

Most certainly does
You need a different gear in the trans or transfer case,that drives the speedo
Now if the speed sensor is the output,then you will need help. I personally do not know, if a scan tool can reprogram the ecm/bcm etc, to correct for the tire change.

Ask that question next.

Nov 05, 2010 | 2005 Chevrolet Silverado 1500 2WD

1 Answer

Speedometer out of calibration by 20mph at 55mph.

It's a cable. If the car doesn't have the same size tires that it came with from the factory, the speedometer will be off. The only way to calibrate it would be to change the the cable drive gears in the transmission, but I have no idea what the gear ratio would be or where you would get the gears. That car came with either P215/75R14 or P205/75R15 tires.

Dec 27, 2009 | 1985 Mercury Grand Marquis

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.

Apr 10, 2009 | 2005 Dodge Magnum

1 Answer

Rim and tires

Your tires will certainly last longer and your steering may be sharper. Here are the issues (having done this on other cars):
  • cars are generally designed to use one size of tire for a reason...too large a tire is not good in the rain, for example
  • your speedometer/odometer will read wrong
  • there is a possibility of body interference in turns or in full suspension jounce
Assuming you do this: make sure your front end is in good condition and use the same width tire. Your car may have a different model with an oversized tire. Ask your dealer what modifications to address the speedometer issue are available.

Jun 08, 2008 | 1996 Nissan Sentra

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