Hi everyone, I'm going to a staggered setup in the spring. Running 17x9 with 255/50 in front and 275/50 on the back. The questionI have is when you use your SCT to program the revs per mile, or tire size, which end of the vehicle do I use the tire sizes from? I don't recall which end the speedo is fed from.

Thanks in advance.

 

You have to go by the rear tire size. If you need the exact number you can get it off of the discounttire website.

 

Oh and I almost forgot, with the SCT X-cal2 you have to return the tune to stock and then reload the custom tune to change the perameters. When you reload the tune it will prompt you to make changes. FYI in case you didn't already know. I scratched my head about that for awhile before I figured it out.