Changing the tire size

[ammar.alqisi]

We have a f150 ecoboost, and would to change the tire size, we have 3 options for it,
1) Driven tire Circ
2) Max Tire Circ
3) Min Tire Circ


How we can fill them and change the tire size .

[Magyar86]

Tire size cannot be change with editor. You have to use special functions in scanner and change rev/mile. You will get a wrench light so you will have to use forscan to reset bcm and tcm. At least that?s how I did it, there might be an easier way now.

[metroplex]

I've always used VCM Editor to adjust the speedometer by tweaking the tire circumference or whatever is in the speedometer that represents rev/mile or circumference. What I do is run a GPS on a flat level part of the road and compare that at a set speed. I check the percentage delta and adjust the setting in VCM Editor by that percentage. After 1 or 2 tries, it will be spot on. I experimented with a 10 Hz GPS (Garmin GLO) and my phone's GPS (1 Hz) and got the same results.