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www.roadandtrack.com/.../a33371/how-to-fix-misreading-speedometer

How to Fix Your Speedometer for Different Size Tires. ... If you've ever modified a car with smaller or larger tires or, ... fix should work for any car with an electronic speedometer—so, not ...

itstillruns.com/recalibrate-after-tire-size-increase-7902206.html

How to Recalibrate a Speedometer After a Tire Size Increase by Alexander Poirier . ... larger tires cause the speedometer to read a speed slower than the vehicle's actual speed while smaller tires cause the speedometer to read a speed faster than the vehicle's actual speed. You may recalibrate a speedometer in a few simple steps.

www.reference.com/vehicles/bigger-tires-affect-speedometer-54ef47807327f7d0

Bigger tires will cause your speedometer to register a speed that is slower than your actual speed. For example, if your speedometer says 35 miles per hour on 20-inch diameter tires, changing to 23-inch diameter tires will make your true speed 40.25 mph, even though your speedometer will still show 35 mph.

www.intercotire.com/calculator_speedometer_adjustment_tire_size_change

Speedometer ratio adjustment calculator. Ever wonder how far off your speedometer is with your new bigger tires? I'm using a simple ratio calculation, so this info will only approximate your corrected speed and depends on the accuracy of tire size diameters (assumimg nothing but tire size has changed).

tiresize.com/speedometer-calibration

Speedometer calibration, or knowing how fast you're going, can be pretty important. We all know a ticket is about the biggest buzz kill on earth! So if you're about to get bigger tires than stock or already have them installed, its time to calculate your true MPH.

wranglertjforum.com/threads/how-to-recalibrate-your-speedometer-after-changing...

How to Correct the Speedometer on Rubicon Models This above speedometer gear change not work on 03-06 Rubicon models. The speedometer on these is electronically controlled and therefore you only have two options: 1) Some dealers are able to re-program the ECU so that it the speedometer will accommodate for different gearing and larger tires.

www.jlwranglerforums.com/forum/threads/here-is-the-cost-to-adjust-speedometer...

I just called the dealer where I bought my JLU Sahara. I asked how much it costs to adjust the speedometer to compensate for larger tires. On the JLU it is a simple software tweak but of course the dealer wants to make that costly.

www.tacomaworld.com/threads/how-to-adjust-speedometer-for-larger-tires.95546

How can I adjust the speedometer for larger tires? Can I do it myself, tire store or do I have to take it to a dealership? Thanks, Killer

itstillruns.com/reprogram-computer-changing-tire-size-7980389.html

When you put different size tires on your vehicle, your speedometer will no longer read the correct speed. Larger tires cause the speedometer to show slower speeds than reality, and smaller tires show faster speeds. You can reprogram a vehicle when changing tire size using an on-board diagnostics system, or OBDII. ...

auto.howstuffworks.com/.../safety-regulatory-devices/speedometer4.htm

But, if a car is modified, its speedometer may need to be recalibrated. Changing tire size is one of the most common things car owners do that can affect speedometer accuracy. That’s because larger tires cover more ground in one complete revolution. Consider the example below.