If you are going by height I'm assuming you have a CS/CTS?
I'm gonna guess somewhere around 2600mm circumference or 83.3 cm in diameter (32.8 inches). If you have a GPS, clear both odometers and drive at least 10 miles. Then enter the values as shown.
Truck Odometer / GPS odometer x (the tire size you've had entered)= new tire size
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