Using the Dealer to set new tire size

[Idahoktm]

I’m waiting for a quote from my dealer, I’ll post back what they say. if it’s much more than $150 I’ll probably go the JScan or AlfaOBD route (thanks @jmrhodes212 for sharing your experience with that!).

My dealer quoted me ~$150. I thought that was a fair price, but $50 more than buying everything to make AlfaOBD work. Since buying AlfaOBD, I've programmed mine and a buddy's tire sizes and a few other things on my truck. I'm also going to program the TPMS for my winter wheels/tires that I had to buy new sensors for, which will save me a trip to the dealer.

 

[jmrhodes212]

I’m waiting for a quote from my dealer, I’ll post back what they say. if it’s much more than $150 I’ll probably go the JScan or AlfaOBD route (thanks @jmrhodes212 for sharing your experience with that!).

Here's what I bought. I liked Jscan because you don't need android, you can use an iphone. All together these were $80 and Jscan was $20.

 

[TrojanRam]

Here's what I bought. I liked Jscan because you don't need android, you can use an iphone. All together these were $80 and Jscan was $20.

View attachment 149369

Thanks, did the same and just ram through the process.

What did you use for the tire size? I measured and rounded. Interestingly when I actually measure the new tires (285/50s) they are roughly 32.5”, which is not that much bigger than what was already in there. Maybe that’s right but is smaller of a change than I expected (and visually, doesn’t check out, new tires look taller).

 

[Idahoktm]

Thanks, did the same and just ram through the process.

What did you use for the tire size? I measured and rounded. Interestingly when I actually measure the new tires (285/50s) they are roughly 32.5”, which is not that much bigger than what was already in there. Maybe that’s right but is smaller of a change than I expected (and visually, doesn’t check out, new tires look taller).

That's normal. The stock 32's are actually about 31.5".

 

[TrojanRam]

That's normal. The stock 32's are actually about 31.5".

That’s what I figured, which then made me wonder: wouldn’t the factory calibration inherently be off then? Not sweating it too much just find it interesting.

 

[Idahoktm]

That’s what I figured, which then made me wonder: wouldn’t the factory calibration inherently be off then? Not sweating it too much just find it interesting.

It should be off by 2-3 mph.

 

[jmrhodes212]

Thanks, did the same and just ram through the process.

What did you use for the tire size? I measured and rounded. Interestingly when I actually measure the new tires (285/50s) they are roughly 32.5”, which is not that much bigger than what was already in there. Maybe that’s right but is smaller of a change than I expected (and visually, doesn’t check out, new tires look taller).

I just used "tire size comparison" for what it said they should be, then I used that. It happened to be exact when I checked GPS vs truck vs my radar detector. All right at the same speed.

 

[Don Juan]

Here's what I bought. I liked Jscan because you don't need android, you can use an iphone. All together these were $80 and Jscan was $20.

View attachment 149369

Will this work on a 2024 1500 DT? If you update tire size, does it correct the shift points?