Question about 1999 Chevrolet Tahoe

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1999 tahoe speedometer is off 15 mph

Changed tires to 265/75/16 and speedwas off 15 mph, used tires one year, changed back to original 245/75/16, speed is of still by 15 mph.

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  • David Cantrell Feb 21, 2012

    The car speedometer was right on before i put the bigger tires on and when i went to the 265 they were taller and threw the speed off 15 mph, and so they wore out and i went back to the 245/ 75/16 and it still reads 15 miles per hour over the correct speed, i have changed the speed sensor on the transmission also.and still the speed is off. Thanks .

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Looks like you changed width of tire and not profile. Should/would not have made 15mph difference anyway. If you purchased vehicle new, I would suspect the road speed sensor needs to be tested. If you did not buy it new, previous owner probably had a set of large profile tires on it and changed the speedo gear/pickup assembly at the transmission.

Posted on Feb 21, 2012

  • Ronald Vance Feb 21, 2012

    it is only 5/8" difference in sidewall height between 265/75 and 245/75.

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Speedometers read the rotation of the drive train, usually in the transmission, and so changing tires will not change the transmission ability to read (count) the rotation.
But the transmission rotation will increase or decrease with different sized tires, since they go around faster or slower, depending on the size change.
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When you replaced the ABS sensor on the hub, did you clean and re-gap the sensor to the speed ring on the hub. There was a recall on the ABS Malfunction on your truck. The tire size don't make a difference to your ABS as long as all four tires are the size, There was a issue bulletin with your Tahoe on the ABS activating under 8 km/h. Good luck and hope this helps, if not clean out the sensor with brake parts cleaner and check the wire harness and ABS sensor bracket. Re gap the sensor to the speed ring hub. Here is the bulletin. Anti lock Brake (ABS) Activation at Low Speeds (Clean Wheel Speed Sensor Mounting Surface) #03-05-25-007C - (05/16/2006) 2001-2006 Chevrolet Suburban, Tahoe, Silverado

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On a 3500 you should have plenty of room, just make sure if you have anything like ABS that you make all the tires the same size.

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It is possible, but you will need to take it somewhere to have it done. They will need to put it on a dyno tester and also connect to computer to reset the speedo.

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On the "a" pillar, or on the edge of the door, there should be a sticker indicating the original tire size. If you change to another size other than the correct size, you will confuse your processor and could cause transmission fault codes. The gear ratio is dedicated to the load geometry for tire size and speed algorithm.

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Hello,

I pulled up your vehicle information in our fitment guide and tires in the 225/60/R15 and 225/60R16 sizes are not load rated for your vehicle. They are also quite a bit smaller than the tires that came on your Tahoe when new. Running a tire that is too small (even if it was load rated) will have an effect on your vehicles performance. We do not recommend installing either of these sizes for safety and performance reasons.

If your Tahoe came with 15" wheels we would recommend looking into the 235/75R15 size.

If your Tahoe came with 16" wheels we would recommend looking into the 245/75R16 or 235/75R16 sizes.

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When i start the car and begin to drive, the steering wheel vibrates, as i pick up speed it stops, i've had the tires rotated and balanced several times, it's fine for a while than it starts again???


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Here is some information for you regarding your problem.

The Tire Inflation Monitor (TIM) system alerts the driver when the pressure changes in one of the tires. The system only detects a low pressure condition while the vehicle is being driven. Once a low tire pressure condition is detected, the system informs the driver that a low tire pressure condition exist's, whenever the ignition is ON.
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  • Monitor Mode 1
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To reset (calibrate) the system:
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There you are, this should fix you up.
Keep in mind this system uses wheel speed sensors to calculate. If one of your sensors isn't working your low tire light will remain on.

Thank you for using FixYa.

KL

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Stock Tire - 215/60R16 >Search Tires Tire 1 - 205/60R16 >Search Tires Section Width: 8.46 in 215 mm Section Width: 8.07 in 205 mm Rim Diameter: 16 in 406.4 mm Rim Diameter: 16 in 406.4 mm Rim Width Range: 5.5 - 8.5 in Rim Width Range: 5.5 - 7.5 in Overall Diameter: 26.15 in 664.21 mm Overall Diameter: 25.68 in 652.27 mm Sidewall Height: 5.07 in 128.77 mm Sidewall Height: 4.84 in 122.93 mm Radius: 13.07 in 331.97 mm Radius: 12.84 in 326.13 mm Circumference: 82.15 in 2086.6 mm Circumference: 80.67 in 2049.0 mm Revs per Mile: 795.4 Revs per Mile: 809.9 Actual Speed: 60 mph 100 km/h Speedometer1: 61.0 mph 101. km/h Speedometer Difference: - Speedometer Difference: 1.822% too fast Diameter Difference: - Diameter Difference: 1.8%

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