Predator and Tire Size will not take???

[MM-JAPAN]

My predator is r8v18 and I loaded the 93 Oct with CAI, then I tried to load the tire size under quick tunes and I would set it and it says everything is OK and then when I go back to the section it says tire size has not yet been set.
Do I need to do it a different way?

Thanks...

[mikel]

Did you cycle the key?
Did the speedo correct itself?