Programming Tire Size with Forscan?

[MrBusses]

I recently put new tires on my Ranger going up to 265/70r17s and I can't seem to find anywhere in forscan where to change the tire size. Am I missing something or does it not exist? I used to be able to use IDS to change it in programable parameters but Ford removed that feature a couple years ago and FDRS lacks it also.

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[Fawnbuster]

I used Forscan a couple of years ago to adjust my speedometer (2019 truck). The only issue I had was my exact tire size increase wasn't listed so I did some checking online and found the next closest size above and below my size and started there. Used my garmin GPS for accurate measurements, stopped a couple of times to tweak it to different sizes until I was consistently within less than a 1/4 mph and left it there. I now have a uniden radar detector that has GPS and mph readout and its dead on. I'm running 285 70 17s now. Had oem 18s.

I've not been back into the software since so I can't advise if or what may have changed but it was in there at that time.

 

[airline tech]

I think that is listed in the BCM, I have stock tires and have not used it. If I recall it is in MM and those that do the tire size change use this website to get a close setting to change it to.

https://tiresize.com/comparison

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