2021 Diesel speedometer spot on after 35s?

[NC_Gladiator]

Hey everyone, I have a brand new 2021 Gladiator Diesel Overland and just threw on 35s (up from 32s). I drove around 50 miles on the highway this morning, everything from 60-85mph and the speedometer was spot on with the gps speedometer on my phone the whole time. I like to think the app works as I used it to dial the speedometer in on my ranger when going up in tires sizes. Any ideas how this could be?

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[bleda2002]

Hey everyone, I have a brand new 2021 Gladiator Diesel Overland and just threw on 35s (up from 32s). I drove around 50 miles on the highway this morning, everything from 60-85mph and the speedometer was spot on with the gps speedometer on my phone the whole time. I like to think the app works as I used it to dial the speedometer in on my ranger when going up in tires sizes. Any ideas how this could be?

Did you have the phone plugged in? If so then the phone actually reads the speed from the speedometer. If you are trying to use an app to calibrate you need to make sure the phone is not connected to the car.

 

[NC_Gladiator]

Did you have the phone plugged in? If so then the phone actually reads the speed from the speedometer. If you are trying to use an app to calibrate you need to make sure the phone is not connected to the car.

I did, this didn’t even cross my mind. I’ll head back out this evening and keep it unplugged. Thank you for the advice!

 

[bleda2002]

I did, this didn’t even cross my mind. I’ll head back out this evening and keep it unplugged. Thank you for the advice!

Well, now you can say you've had your jeep over 90 cause at 85 with what i'm assuming are 305/70r18's up from the 255/70's you were doing like 92. Shocked you didnt notice it being off when you hit 88 and the flux capacitor lit up.

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