2016 1500 Tire up size

[JMAGOO]

I have 17 in wheels and am going to 20 in. The 20's are stock. I went to dealer to see what is would take to change programing. They $140 to change it and also $250 more if my ECU doesn't gave programmer in it. Is there any way around this? Or maybe a cheaper option?

 

[kurek]

If the outside diameter of your tires isn't changing, no need to recalibrate.

Otherwise there are tire size recalibration tools available from the aftermarket; for example this one from Rough Country will do it, and if you change tire size later on you can do it again because you already own the tool.

 

[RoadRamblerNJ]

When I built/lifted my '76 K-5 Blazer, I put 36" **** Cepek's on. No $$$ left to change trans gear out.
Had a friend pace me on the GSP and marked down my speedo's incorrect #'s with him doing 55, 65, 75 mph in Drive. Only had L1, L2 & D in a TH400 tranny. 75 mph read about 48 in the Blazer.
Not sayin' this is for you. Just remembering how friggin easy and cheap it was to do something to your ride back then.

 

[BOWERSFJ]

Wheel size doesn’t matter ... Computer doesn’t care what size your wheels are ... Actual outside diameter of the tire is the only thing that matters ... And that doesn’t even matter that much ... I went from 33’s to 35’s, and didn’t change a thing ... Winter tires are 34’s ... The truck still doesn’t care


Sent from my iPhone using Tapatalk

 

[JMAGOO]

Thank you for info. I will be going from 265/70 R 17 to 275/60 R 20

 

[canadiankodiak700]

Definitely need to change it for that, roughly 31.5 to a 33

Sent from my Pixel 2 XL using Tapatalk

 

[pacofortacos]

Other than the speedo being off a few mph, not much will change if you do not change it.

It is as simple as the dealer changing the options the truck came with - how do I know? On m 2016, I did exactly as you are. Dealer changed it for free for me. Though to be honest, I do know the tech.

You could also change the tires to a 275/55/20 and not do anything as it will be 31.9" tall.

That all being said, there are many many tools available to change it on your own Alpha OBD is one I think and it will also let you do other things.
https://www.ramforum.com/threads/alfaobd.123982/page-866#post-2123542