Speedometer compensation for tire size?

[jimbo285]

The SR5 has approximately 31” tires and TRD Off Road has approximately 33” tires but they both have 3:73 gearing. How is the speedometer corrected? I plan on bigger tires eventually. Thank you

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[markusSR5]

The speedometer is not correct on the sr5 with stock tires, at least on mine it was not. Verified with gps, my vehicle was going 66 mph gps speed and my speedo would read 70 mph. Apparently Toyota calibrates all the 4 runners the same despite the sr5 coming stock with baby tires. I had to put on 265/70r17 to get my speedo to now be within 1 mph difference. My local dealer shop foreman said that not even he can recalibrate the speedos anymore. Toyota does not give the option to calibrate it. So why did Toyota decide to put baby tires on the sr5 starting with the gen6 4runner? And not even bother to correctly calibrate the speedo for the baby tires? Well that's the million dollar question, but after driving for just over 3k miles now, I am guessing that the 4runnner epa sticker mileage numbers are based off an sr5 with baby tires, the front air dam installed, and a jockey with a very light foot driving it. That's just my guess though.

 

[brumey]

My SR5 with the OEM wheels and tires is within 1 MPH when checked with a couple of GPS devices.

Although, I do intend on replacing the OME size with the 265/70/R17 when the current tires need replacing.

Do you get better on road compliance over pot holes and bumps with your 265's?

There is a gizmo to plug in to recalibrate, I cannot think of the name right now.

 

[127.0.0.1]

The speedometer is not correct on the sr5 with stock tires, at least on mine it was not. Verified with gps, my vehicle was going 66 mph gps speed and my speedo would read 70 mph. Apparently Toyota calibrates all the 4 runners the same despite the sr5 coming stock with baby tires. I had to put on 265/70r17 to get my speedo to now be within 1 mph difference. My local dealer shop foreman said that not even he can recalibrate the speedos anymore. Toyota does not give the option to calibrate it. So why did Toyota decide to put baby tires on the sr5 starting with the gen6 4runner? And not even bother to correctly calibrate the speedo for the baby tires? Well that's the million dollar question, but after driving for just over 3k miles now, I am guessing that the 4runnner epa sticker mileage numbers are based off an sr5 with baby tires, the front air dam installed, and a jockey with a very light foot driving it. That's just my guess though.

stock tire sizes
my 99 4runner, dead accurate
2013 tacoma, dead accurate
2010 yaris, accurate

2022 rav4 ? 2 mph over (and everyone the same on rav4 forums)

got a size up on tires to get closer to actual speed on display
**NOTE: the speedo display would be 2MPH off, but the odometer on
measured miles was generous, and recorded less miles traveled than actual
---based on odometer being close to accurate and getting a free tenth every
3 miles, and the speedo was showing 70 when doing 68, I know it has to be intentional
'cuz if Odo followed speed, we'd be getting robbed of mileage (and warranty)

2025 4runner, 2MPH off. I just went from 245/70 to 265/70 to get closer to accurate
https://www.tacomaworld.com/tirecalc

 

[Dog4Runner]

Interesting. I've noticed my odometer shows more miles getting to work driving ORP than driving my last two Fords. (Stock wheels).
I thought Toyota was sued years ago for this.

 

[127.0.0.1]

my toyota odos all show either close to exact miles
or less miles than actual. I drive miles of measured
posts and can watch the tenths drift in favor usually
by 5th or 6th mile, and keep under reporting

 

[Jared72]

I drive semi and have for a number of years, I would be very surprised if it wasn’t a simple fix with a computer hooked up. That is how the mechanic did it on our semis they would just take the tire height and input that number in the computer and the speedometer would be adjusted.

 

[Dinosoar21]

My SR5 with the 30.5" OE tires is about 3MPH off compared to GPS metering. I will be installing 31.5" tires soon and I suspect that help make it more GPS-comparable. But the real answer to your question is, or should be, Toyota should be able to adjust the calculation...I was once told that Ford does this for its trucks. I did not see anything in the manual or dash that allows the owner that adjustment capability.

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