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Old 02-21-2010, 03:48 PM
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Mileage Correction

Looking for help. How far off will my odometer be off if I run 285/75r16s in place of stock 265/75r16s? I am sure this has be covered before, but I can't find anything. Maybe someone has a link to a conversion calculator.
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Old 02-21-2010, 06:55 PM
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New tires will make your speedo show 2mph slow @ 60.

Miata Tire Size Calculator
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Old 02-21-2010, 07:08 PM
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so does that mean i am traveling 3.7 miles more than my odometer is reading?
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Old 02-22-2010, 05:45 PM
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Quote:
Originally Posted by Davey~do View Post
New tires will make your speedo show 2mph slow @ 60.

Miata Tire Size Calculator
That is a very cool link you posted
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Old 02-22-2010, 06:00 PM
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My speedo reads 2 mph faster than what I'm driving according to my GPS and it is with the stock size tires. Can that be adjusted with the SCT?
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Old 02-23-2010, 03:28 AM
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Quote:
Originally Posted by dhanna6powerstroke View Post
My speedo reads 2 mph faster than what I'm driving according to my GPS and it is with the stock size tires. Can that be adjusted with the SCT?
No. Tire size adjustment on the SCT only modifies the shift points. To adjust the speedo you need something along the lines of the Autoenginuity scanner or the like.
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Old 02-23-2010, 04:31 AM
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I thought there was the ability to program the tire Revolutions Per Mile into the computer to adjust the speedomoter correctly??? This was how I made the fix on my other trucks when I changed tire sizes so do not know why this would be different.
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Old 02-23-2010, 04:54 AM
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One of the things that is keeping me from going to a larger tire is the apparent complexity fo correcting the speedo.
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