I tried to run a search for this but couldn't find anything. I am trying to figure out what I should enter into the Hypertech Max Power programmer for my 35" Toyo M/T tire size. Anyone out there get an accurate speedo reading at a certain size for the Toyo??? Using a measuring tape I came up with 33.5" at the shoulder, so that is what I programmed. I am just not sure if it is accurate. Any help would be appreciated!!

 

That sucks... Your 35's are only 33.5. Thats and 1.5" difference. I could understand 34.5.

 

Have a GPS reading your actual speed at different tire sizes, this is how I got my MTC 37 to work with 5.13 R&P I had to put 35" for perfect speedo reading as per my accurate GPS.

 

Hey my km2's measured the same at shoulder higher in center, I think I put 34.25 and it has me dead on according to radar gun I will check tonight to make sure thats what I put. I know I am correct at 25/50/70mph