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Reprogram for tire size

spinxt

Active Member
Joined
Oct 12, 2019
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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 ‍♂️
 

Captain Stack

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Jan 22, 2019
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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!
 

troutspinner

Ram Guru
Joined
Aug 16, 2018
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Location
SE Pennsylvania
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

Ram Guru
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Dec 21, 2018
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New York
I bought the rough country speedo calibrator from someone on here
 

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