Was wondering how to program the superchips for bigger size tires.I went from the stock 17" to 20s on y truck . The manual says to measure the tire atthe highest point, So is it as easy as just measuring the tire from ground to top of the tire and imputing that measurement. or is there a more accurate way of doing this.

 

they had this link on a different thread http://www.moparregister.com/calc.php

 

The rim diameter (17" or 20") means nothing, when you're using tires of an equal tire height. The tires on the 17" rims are approximately the same height (31.75") as the tires on the 20" rims. They (20") may be 3/4" taller, if that....

Since that's the case, during your questioning that you'll see in the programmer, it'll ask you, "Change tire size?"

You click "Yes" and it'll start with 31.75". To find the height of your new 20" tires on rims, just take a ruler and hold it level off the tread, and measure with a tape measure, the height from the ruler to the ground. Estimate at.....32.5".

Just hit the "up" arrow key to change the tire height to 32.5", hit "enter" and it's that simple.......

 

. I used a carpinters ruler with a level on it. Im getting 32 1/4 u know if there is a setting for this or go up to 32 1/2??

 

I got it . Tahnks. By the way the programmer works great it gives you the option by 1/4 incriments . I reccomend the SC programmer.