Changing Wheel Size Effects

[NonFord]

I actually just did this. Went from the OEM 20's to OEM 18's. The diameter difference is very close and only off sets the speedo off by 1 mph. However, I did use AlphaOBD to program the right tires. I did it for a few reasons, better ride (got rid of the famous vibration), more tires to choose ( I got the Goodyear Adventures AT w/Kevlar for 600 on all corners), and as you can see, alot cheaper on the wallet for rubber....I like the change!!!!

 

[brcbruiser]

I have a question, i need to recalibrate my Tire size on my 2019 is there a tool out there specifically for this or would i need to take into dealer and have them do it. i do not want to run any risk of connecting something that will mess with or question warranties at all. Any input is appreciated.

So far i went from Stock LT285/60R20 (approx. 33") to 35x12.50, i will most likely be going up to a 37" in the next year or so, but i want to correct the speedo for that drastic of a jump.

The Procal from AEV is great at this. https://www.aev-conversions.com/product/ram-procal/#year