jonathanalberto007 try setting your tire size to 285/55/20. By setting a taller tire should match the speed to what your above.

Finally figured it out! With factory tune and the bigger tires the speedo was 3 mph fast. When I programmed the 87 tune with the bigger tire it was 3-2.5mph slow. I don't know if it is the tune or the truck that is interpreting it wrong. The size that I programmed in the 87 tune to make the speedo ...

Everything on the truck is stock, except new tires.

I have tried increasing the rim size also and gives me the same problem. Whether increasing aspect ratio above 75 or rim above 16 my stability control is disabled. Haven't tried tire width since it doesn't matter to me. Has anyone tried to go bigger than a 285/75/R16 on a newer U7193? Even when I ...

Stock size was 265/70R16 I currently have 285/75R16. When I enetered 285/75R16 the speed was off by 3mph. I tried adjusting the aspect ratio to 76 and higher, and it disables the stability control. The tires are only 32.8in diameter. I reset parameters and then modified the tire size, several times ...

I have tried that and what happens is the truck turns the stability control off and it will not respond to the button, until I restore to factory. The aspect ratio turns the stabiltity off once I go over 75. Is there something I am doing wrong or is there something else happening. Using U7193 9r03 ...

Did everthing you did also. I just recieved mine on Monday and am having the same issue. I also have a U7193 with version 9r03 and all it says enter actual. My speedo is still off by 3mph.