Mileage Correction

[firebill18]

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.

[Davey~do]

New tires will make your speedo show 2mph slow @ 60.

Miata Tire Size Calculator

[firebill18]

so does that mean i am traveling 3.7 miles more than my odometer is reading?

[RANGER295]

Originally Posted by Davey~do

New tires will make your speedo show 2mph slow @ 60.

Miata Tire Size Calculator

That is a very cool link you posted

[dhanna6powerstroke]

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?

[Davey~do]

Originally Posted by dhanna6powerstroke

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.

[Gray Goose]

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.

[3pedal]

One of the things that is keeping me from going to a larger tire is the apparent complexity fo correcting the speedo.