Tire Size - Speedometer vs Actual MPH Calculator

[FatBoy01]

You got bigger tires on your JL/JLU. You can find out exactly how far off your speedometer will be now:

Go here and enter your old and new tire size into the calculator:
https://www.tacomaworld.com/tirecalc

I like to use the MPH app on my smartphone to see the true difference between speedo and actual.

MPH difference actually changes as you wear the tire tread down.

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[FatBoy01]

Your Dealership can re-calibrate your JL's speedometer for you. Will cost approx. $125.00+- for the dealership to do. Of course, the day will come when there will be an aftermarket tool/module to do the re-calibration.