Reprogram for tire size

[spinxt]

Is there a way to reprogram the 2019 Ram for a new tire size, I’d like to go with a 65 series tire on my stock 20s. If I go up to say a 265/65/20, it will result in a speedo difference of about 5mph at 70mph.
I’d love to be able to reprogram the trick to the new tire size ‍

 

[bbbeeennnjjjeee]

Search

 

[sman301]

I believe you need to get a dealer to do it.

 

[bbbeeennnjjjeee]

I believe you need to get a dealer to do it.

You don't

 

[Bay Area RAM]

Rough country makes a speedo programmer.

 

[Captain Stack]

You can get a one-off speedo programmer from Rough Country or you can install the Pulsar from Diablo Sport and set tire size and gear ratio's using the Pulsar. I have the Pulsar installed and love it!

 

[AbitaPro]

I have used HYPERTECH Speedometer Recalibrator in the past on other brand trucks.

 

[Adrianp89]

A good tire shop should have a tool to do it.

 

[troutspinner]

I went up 2” from stock tire size and my speedo is accurate all the way up to 84 (highest I’ve gone in the truck) and I never reprogrammed. I don’t get it but the Speedo and GPS from phone matches.

 

[W13NY]

I bought the rough country speedo calibrator from someone on here

 

[agjr85]

I bought the hypertech one and about to use it this weekend.