Tire sizes/mph
#11
#12
You can use this to figure out your tire diameter:
https://www.dieselbombers.com/calculators.php
After you have the diameter, use one of the following for circumference:
pi(3.14) x Diameter
OR
2 x pi(3.14) x Radius.
Enter the calculated number into the chip, should work out.
With your stock tires you have a diameter of 30.47".
30.47" x 3.14 = 95.6758"
If your new tires are 315/75R16's, they will have a diameter of 34.6".
34.6" x 3.14 = 108.644"
https://www.dieselbombers.com/calculators.php
After you have the diameter, use one of the following for circumference:
pi(3.14) x Diameter
OR
2 x pi(3.14) x Radius.
Enter the calculated number into the chip, should work out.
With your stock tires you have a diameter of 30.47".
30.47" x 3.14 = 95.6758"
If your new tires are 315/75R16's, they will have a diameter of 34.6".
34.6" x 3.14 = 108.644"
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WyoCumminsGirl (09-07-2010)
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