Can A Change In Tire Dia. Be Calculated Accurately?? - Page 2 - Jeep Garage - Jeep Forum

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Old 10-13-2016, 07:57 AM
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Re: Can A Change In Tire Dia. Be Calculated Accurately??

You would think by now, the way cars have advanced, they would have a speedometer adjustment on them for different size tires. Aftermarket tires are so popular today.

It wouldn't help on my old truck, but they could easily have a page on the U-Connect, listing all the different tire sizes that would clear the wheel wells on a Grand Cherokee. Just touch the tire size you installed, hit "APPLY", and your odometer and speedo would be dead nuts accurate. It could even automatically make adjustments based on the tire pressure you happen to be running at the time.

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Old 10-13-2016, 02:42 PM
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Re: Can A Change In Tire Dia. Be Calculated Accurately??

Quote:
Originally Posted by DriverDave View Post
A quick search shows your original tires were 28.9" dia (new) and the new ones are, of course, 31" (new). It will take a bit of searching/calculating to sort out the mileage difference between the 2, but you're on your own for that ;-)
31/28.9 [or 1.07266] times the mileage after the swap is going to be really close--or just add 7%

Closer than you can get without actually measuring the circumference of both, since tire brands do vary in their actual vs theoretical circumference.
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