Brakes and Tires
Ford Trucks and SUVs
Ford Ranger XLT

How do you adjust your speedometer on a 93 F-150 after changing the tire size?

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2011-01-15 03:03:32
2011-01-15 03:03:32

Trust me you can take it to a shop they can do it you cant unless shown how to, its not easy.Easy way is to get a buddy to drive next to you and see how fast hes going compared to you.And you will know how much slower you are and you can adjust your speed using your brain!! Always a good thing!!!!! You can also use this formula (before driving is preferred) to figure your actual speed:

(NEW tire size / OLD tire size) * Speedometer reading = Actual Speed

For example going from the stock 235/75R15 to 31x10.50R15 would go like this:

(31/28.88) * 75 = 80.5

there is a small gear on the end of your speedo cable at the trans.the gears range from 16 teeth to 21 teeth each tooth is good for about 5 mph.count how many teeth you have now .determine desired adjustment and add or subtract teeth needed to get correct speed .pick up at dealer by saying i need a 18 tooth drive gear or as needed.

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A guage/ auto electric or speedometer shop can recalibrate the speedometer to adjust for bigger or smaller tire size. Why do you want to know that?

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It does not change the actual speed of a vehicle but changing tire size can affect the accuracy of the speedometer.

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It will depend upon your bike. Older vulcans used a mechanical speedometer (a cable runs from the front wheel to the back of the speedometer. I don't know of a way to adjust these. other than changing your tire size (not recommended). Newer bikes use an electronic speedometer, and for this there is a fix. A little device called Speedohealer. It took a few tries to calibrate, but now my '07 1500 reads dead on. http://www.xtsportbikeaccessories.com/SpeedoHealer_HealTech.html

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It wont. They will only change when you increase/decrease the size dramatically as the wheel or tire. A one inch change wont make a difference.A more accurate answerIt's true that the size of the rim does not directly have any impact on the speedometer accuracy. But changing the rim size generally means that you'll be changing the size of the tire. The speedometer is directly affected by the circumference of the tire that is used. If you use a tire with a 10% larger circumference, the speedometer will indicate that you're going 10% slower than you really are. If you match the circumference of the 14 inch tire to the circumference of the 15 inch tire, the speedometer accuracy will not change.

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This truck has an electronic speedometer. There is no speedometer drive cable, and therefore no drive gear to change to adjust the ratio. You can buy a box for around $170 that is inserted into the sensor circuit to adjust the speedometer readout. You can figure out how to reprogram the speedometer. Those are the options I have found. I am dealing with this issue on my girlfriend's son's S-10. Further research found this reference, which looks good to me. This weekend, I'm going to find the DRAC module and modify it according to the directions. The electronic module is very specific. Is it worth spending the money just to "calibrate" the speedometer. What are the symptoms of the uncalibrated speedometer. Wheel size change. Tire size change. It would be cheaper and faster to just have a dealer do it then you wouldn't have an expensive piece of useless equipment taking up space

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No, changing the size of your rims and tires will not mess up your transmission. It will mess with your gas mileage and your speedometer though.

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The answer depends on the size of the tire in relation to the original tire size. A tire with a smaller circumference will turn more at a given speed, which will cause a higher speed being displayed on the speedometer. A tire with a larger circumference will lead to a slower speed being displayed. The speedometer can be calibrated to correctly display the speed for a different tire size. Changing the size of tires on a vehicle will also change the way the vehicle handles and may cause faster wear on suspension components.

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Many speedometer shops do it routinely. If it off significantly, they change the little gear in your trans that turns the cable. It's od determines ratio which determines what you see. I have heard a digital is easier but no adjustment can be made until it is determined how far off yours is by running on a dynomometer type machine. If tire size is close to original, discrepancy is negligible.

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if the diameter will be greater or less then the speedometer will be effected

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Yes, but changing tire size affects driving characteristics, fuel economy, and speedometer accuracy among other things.

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If you change the size of the diameter of the original size of tire , YES If you go LARGER in diameter , you will actually be going FASTER then your speedometer indicates and If you go SMALLER in diameter , you will actually be going SLOWER than your speedometer indicates

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They can but changing tire size will change speedometer readings and the way your car handles. You also must have all four the same size. There is a link to a tire size calculator in related links.

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Speedometer gears are made of plastic or nylon they wear out. Changing Tire diameter can also mess with a speedometer. Tire size change can be corrected by getting the right sized speedo gear install to correct for the change in tire diameter.

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The size of tires can effect that accuracy of a speedometer. Larger tires will cause the speedometer to read less than you are actually going.

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It will need to be recalibrated at a shop that specializes in speedometer repair.

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Putting larger tires on your car will give you higher top spee with less torque. However, changing the tire size will make your speedometer inaccurate.

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Year for year and size for size they are a direct swap. In other words, a 5.4 from an F150 is the same as a 5.4 from an Expedition. There are also years that will interchange but I am not certain which ones are direct swaps. The Expedition is based on the F150 platform.

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If the outside diameter changes, then the speedometer will change

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The speedometer does not take into consideration the size of the tires. It measures the rpm's of the transmission or differential. **incorrect, the speedometer uses a predetermined constant based on the circumference of the stock tire diameter multiplied by the number of revolutions** I suggest driving alongside a friend who can signal you when his speedometer reaches predetermined speeds according to the speed zone and check your own speedometer to determine the speed you need to drive for that speed zone. Do this on a rural road with no oncoming traffic to avoid any accidents.


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