6.4L RAM 2500 CAN'T CHANGE TIRE SIZE

[JohnnyRam]

Just tried to install the 93 octane tune on my truck today using the advanced tunes. When I tried to adjust the tire size for my 37" tires, it fails to update the parameters. I even tried to put in a smaller tire size and it still didn't work. Is there any way to fix this. When I bought this tuner and PCM, tire size adjustment was one thing I was really looking for.

[mikel]

if you go to tire size by height, and change it from what it shows to say 33, then let it fail, and go back and look at that value again, what does it show?

[JohnnyRam]

I'll have to see, I haven't tried that yet. However, I did notice that my speedometer has changed to reflect the tire size changed I attempted to make. Even though I restored my truck to the original backup and then reinstalled my stock PCM. Is that normal?