Tire size change with tazer mini

[TxGladiator]

Put on 285/70/17 tires and I’ve read a couple of different things on what size to change to on the tazer mini?
Thanks

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[Mkcagle]

Measure your tire, standards on actual tire diameter seem a bit sloppy.

 

[TxGladiator]

Measure your tire, standards on actual tire diameter seem a bit sloppy.

I measured it right about 31.5.
I’ve seen others saying 32 or more.
Put the tazer at a setting just over 31.5 for now.

 

[Mkcagle]

I used a couple of independent GPS units to verify my settings. Found it necessary to readjust a couple of times before all matched.

 

[SquirrelNuts]

I used a couple of independent GPS units to verify my settings. Found it necessary to readjust a couple of times before all matched.

How far off from what you measured did you have to set the Tazer to be accurate? I'm having trouble getting mine set appropriately.

 

[Mr._Bill]

How far off from what you measured did you have to set the Tazer to be accurate? I'm having trouble getting mine set appropriately.

Try measuring from the ground to the center of the wheel and then doubling. That should get you close, or at least at a good starting point. The diameter will vary with air pressure, and the manufacturers size listing is not always accurate.

 

[SquirrelNuts]

Try measuring from the ground to the center of the wheel and then doubling. That should get you close, or at least at a good starting point. The diameter will vary with air pressure, and the manufacturers size listing is not always accurate.

Yeah, I measured using a 3ft level off the top center of the tire to get my measurement. My 315/70r17s measured at 33.25. Programmed that into the Tazer, but speedo still slow from actual (two different GPS apps) by about 1.5mph. Kept adjusting the tire size up... now programmed at 35" and still off by about 1.5mph.

Wanted to see how far off you needed to adjust to get it right? I feel like it shouldn't need to be that far off.

 

[SquirrelNuts]

Yeah, I measured using a 3ft level off the top center of the tire to get my measurement. My 315/70r17s measured at 33.25. Programmed that into the Tazer, but speedo still slow from actual (two different GPS apps) by about 1.5mph. Kept adjusting the tire size up... now programmed at 35" and still off by about 1.5mph.

Wanted to see how far off you needed to adjust to get it right? I feel like it shouldn't need to be that far off.

Well... update this morning. Driving into work and now the speedo is 2mph off in the other direction (as I would have expected when set to 35") Weird. I guess it takes some time for the computer adjust and it doesn't happen immediately after changing the size setting and doing a full reboot... Gotta work on my patience I suppose!

 

[mmatthie]

I measured it right about 31.5.
I’ve seen others saying 32 or more.
Put the tazer at a setting just over 31.5 for now.

I have the same size tires...mine measured 32 1/8"

 

[AZJT]

Yes, it will take some 'playing around' to get it right - I probably tweaked my Tazer setting 4-5 times before the speedo finally reconciled with other methods I was testing. Be patient - it most likely won't be the same as what you've measured directly.

 

[Michael8780]

I'm having the same issue where the Tazer doesn't lock in my tire settings even after several sleep cycles. I've changed the tires size so far extreme just to elicit some type of change but gps says I'm consistently 3 mpg over

 

[Mr._Bill]

I'm having the same issue where the Tazer doesn't lock in my tire settings even after several sleep cycles. I've changed the tires size so far extreme just to elicit some type of change but gps says I'm consistently 3 mpg over

Do you have your phone connected to the USB port while trying to check the MPH calibration?

 

[Mr.Wilson]

Yeah, I measured using a 3ft level off the top center of the tire to get my measurement. My 315/70r17s measured at 33.25. Programmed that into the Tazer, but speedo still slow from actual (two different GPS apps) by about 1.5mph. Kept adjusting the tire size up... now programmed at 35" and still off by about 1.5mph.

Wanted to see how far off you needed to adjust to get it right? I feel like it shouldn't need to be that far off.

I went round and round with the same issue. I ended up programming (as close as possible) as what ever the spec of the tire is. I tried the exact measurement method but the actual tire spec worked the best for me.

 

[Michael8780]

Do you have your phone connected to the USB port while trying to check the MPH calibration?

No but I do have and android auto dongle plugged in

 

[Mr._Bill]

No but I do have and android auto dongle plugged in

It has been reported that if the phone has a connection to the truck, it will show the speed reported by the truck and not the speed being measured by the app.

A standalone GPS unit is probably the best way to test. Using the mile markers on the side of the freeway is another option. Look for one of those radar signs they deploy in school neighborhoods or construction areas.

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