Tire size question

[dsnotarianni]

I have a 2004.5 LLY with the pred 2.02 software and I have 315/70/17 tires on my truck but when I plug that tire size in the speedo is not correct anyone have info on correct size to plug in?

Thanks for any info.

DAN

[mikel]

you need to reset paramaters, then put the factory tire size in first, then put in the new (actual) tire size.

Or, send it in for the hardware upgrade and only have to enter the new size