Speedometer Recalibration

dklozik · Dec 3, 2021

I changed stock tires to 275/65/20, so obviously my speedometer was off per GPS, about 5pmh at 70. So, I hooked up the AlfaOdb and just picked the closest tire size to mine that was listed. After the change it was off 2mph at 70. It was late and I didnt feel like going to the process getting the correct size in. Yes, I was being lazy. However, i drove it the next day and my speedometer was now showing dead on with the GPS speed. I got it up to 90 and it was still accurate. Ive read about some people's truck recalibrating on its own, but was skeptical. Mine is a '21 built in mid 2021, if that makes a difference. Is this a '21 thing or is it just sporadic?

retired · Dec 3, 2021

was it a stand alone gps or your trucks nav system that you were using?

mtnrider · Dec 3, 2021

I've Never heard of a truck re-calibrating itself before? My guess is your settings hadn't actually taken yet (sometimes Alfa settings take a key cycle or 2 to take affect). Or your GPS reading wasn't accurate.

.

dklozik · Dec 3, 2021

Im using Waze for my GPS speed on my cellphone. Its accurate in my work car and my kids truck, so it should be accurate here.

John Jensen · Dec 3, 2021

GPS data can vary slightly. Its accuracy depends on how many satellites are connected and in what order they connect. Most devices report the % accuracy.

2mph at 70 is basically dead on. I suspect the dead on reading was due to better satellite connections.

Jimmy07 · Dec 3, 2021

dklozik said:
Im using Waze for my GPS speed on my cellphone. Its accurate in my work car and my kids truck, so it should be accurate here.

If you were using Waze via Apple CarPlay while plugged into the media port, then the phone’s native GPS is not being used, and it will mirror the truck’s GPS for speed.

John Jensen · Dec 3, 2021

Jimmy07 said:
If you were using Waze via Apple CarPlay while plugged into the media port, then the phone’s native GPS is not being used, and it will mirror the truck’s GPS for speed.

I didn't know that. I thought the truck screen was just mirroring the phone's screen and data.

dklozik · Dec 3, 2021

I was using Waze with Android Auto, but my cellphone was unplugged.

retired · Dec 3, 2021

down load the ulysse speed app on your phone and try that using only your phone.

John Jensen · Dec 3, 2021

I use COOL NIKS GPS Speedometer and Odometer app. Tried several, found this the best for me.

CheechDogg.0n37s · Dec 3, 2021

retired said:
down load the ulysse speed app on your phone and try that using only your phone.

That is the one I use ... love it !

dklozik · Dec 6, 2021

I downloaded the Ulysse speed app and my speedometer is exact at 80mph.

Justin33 · Mar 15, 2023

I’m gonna try what I’ve read in here I also just put on 275s 275 65 20 duratracs. I can’t seem to find a sweet spot I’ve went aneyehrre from 2672 to 2708mm and the truck is showing 70mph while my phone says 68 with speedometer app? Any ideas guys?

Justin33 · Mar 16, 2023

Justin33 said:
I’m gonna try what I’ve read in here I also just put on 275s 275 65 20 duratracs. I can’t seem to find a sweet spot I’ve went aneyehrre from 2672 to 2708mm and the truck is showing 70mph while my phone says 68 with speedometer app? Any ideas guys?

Have t been able to get it dead on or is 2mph at 70 acceptable. Truck will read 70 phone says 68.

Justin33 · Mar 22, 2023

Anyone have a Bette rides what mm I need to try and put it to get this to be perfect. Haven’t been able to hit it yet with what I’ve been trying.

Speedometer Recalibration

dklozik

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retired

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mtnrider

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dklozik

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John Jensen

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Jimmy07

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dklozik

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retired

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dklozik

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