Hi, everyone. Back at the end of Jan I purchased a 05 3500 crew cab with a nv5600 and 66k on it. I have done a bunch of add ons. Most of which were inpact protection or practicality. I just added a set of 255 70 22.5" tires wrapped around powder coated Alcoa wheels. I ordered a Hypertech Hypermax to recalibrate the wheel size for the speedo. According to UPS I should have the programmer tomorrow.

My question is to those who have used the Hypermax to do this before. What do I need change to do this? Will it flat out ask me for the rim/tire size or will I need to know the actual tire height it is? If so does anyone know what that is for my tire (255/70/22.5)? Thank you

Robert