Speedometer recalculation

[Halfpint81]

Hey I was just wondering if anyone has a set of BFG k02 295/65r20 on their truck and wondering what tire size you set your calibrator to. I’m using a Taser DT that’s the only on that would fit to a digital dash. Thank you for the help

 

[Dewey]

I used this calculator to get my tire diameter and entered the size with my Tazer. Speedo was right on after.

Wheel Offset Calculator

Use our wheel offset calculator to visualize the new tire position when changing wheel and tire sizes. Convert wheel offset and backspacing to calculate the correct setup for your vehicle.

tiresize.com

 

[theblet]

Hey I was just wondering if anyone has a set of BFG k02 295/65r20 on their truck and wondering what tire size you set your calibrator to. I’m using a Taser DT that’s the only on that would fit to a digital dash. Thank you for the help

I went with 33” tires and used jscan to calibrate. Not sure how the taser works. I would recommend using some speedometer apps on your phone (not plugged in to the trucks usb) to compare to the speedometer. That helps with fine tuning

 

[Halfpint81]

I went with 33” tires and used jscan to calibrate. Not sure how the taser works. I would recommend using some speedometer apps on your phone (not plugged in to the trucks usb) to compare to the speedometer. That helps with fine tuni

I used this calculator to get my tire diameter and entered the size with my Tazer. Speedo was right on after.

Wheel Offset Calculator

Use our wheel offset calculator to visualize the new tire position when changing wheel and tire sizes. Convert wheel offset and backspacing to calculate the correct setup for your vehicle.

tiresize.com

Okay I’ll give that a try thank you, I tried the average of all 4 tires if that doesn’t work I’ll do that

 

[Halfpint81]

I went with 33” tires and used jscan to calibrate. Not sure how the taser works. I would recommend using some speedometer apps on your phone (not plugged in to the trucks usb) to compare to the speedometer. That helps with fine tuning

I do have gps speed app on my phone and noticed the speed was off even though the dealership said they adjusted it

 

[theblet]

I do have gps speed app on my phone and noticed the speed was off even though the dealership said they adjusted it

I gotcha. I used three different ones to compare it to. I’m sure free apps won’t be 100%. You could also drive by one of those speed signs. We’ve got a few in the area

 

[Dewey]

I just went off the Waze app MPH reading on Uconnect. Noticed right away I was off 5 mph at 60 which was exactly what the Tire Size app calculated.

 

[theblet]

I just went off the Waze app MPH reading on Uconnect. Noticed right away I was off 5 mph at 60 which was exactly what the Tire Size app calculated.

I started there, and fine tuned. Guess my tires aren't quite 33" tall.

 

[limechallenger]

Put a level on top of the tire , level it ,and measure to the bottom of the level. That's your tire height/ outside diameter. Most tire sizes are off of what they say.

 

[Halfpint81]

Put a level on top of the tire , level it ,and measure to the bottom of the level. That's your tire height/ outside diameter. Most tire sizes are off of what they say.

Okay thank you I’ll give that a try

 

[djheywood]

I usually dont recalibrate as it shaves a few miles off the truck odometer over the years it really adds up ha! Guess it depends on how much you changed the tire size to really have a significant diff. on the speedometer.

 

[theblet]

I usually dont recalibrate as it shaves a few miles off the truck odometer over the years it really adds up ha! Guess it depends on how much you changed the tire size to really have a significant diff. on the speedometer.

True, but it will also mess with other reporting features like oil life, DTE, etc. I agree that I didn’t really worry about it going from 32” to 33” tires at first. Glad I did it now tho

 

[Halfpint81]

I usually dont recalibrate as it shaves a few miles off the truck odometer over the years it really adds up ha! Guess it depends on how much you changed the tire size to really have a significant diff. on the speedometer.

I went from 33 to 35 so my speedo was about 7km off. Since I’ve recalibrated the shifting in my truck has been a lot better