Larger Diameter Tires than OEM - Issues with vehicle / warranty / etc.

[gestut]

I don't see it being an issue and Toyota is telling you "other issue" just to protect themselves. The factory diameter for off road trim is 32.6 so fit won't be an issue. I think the speedometer tool is likely a good estimate, i'd imagine it changes vehicle to vehicle though. Plus most jurisdictions aren't ticketing for going 3 MPH over. Thursday I hope to be taking mine up to 33.2 and not giving it a second thought.

Will there be any performance degradation and stress on engine / transmission from larger tire..?I wonder if off road trim has different final gearing vs base sr5.

I have base sr5 and want to upgrade to bigger tires as well

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[richiecass]

I have 285 70 17 wild peaks on my sr5. The speedometer is 2 miles an hour off. I had it at the dealer and they said there was no calibration that can be done to change that. So the speedometer register is 2 miles an hour faster than I'm actually going.

 

[Franco]

I have 285 70 17 wild peaks on my sr5. The speedometer is 2 miles an hour off. I had it at the dealer and they said there was no calibration that can be done to change that. So the speedometer register is 2 miles an hour faster than I'm actually going.

I have 34s (Came with 33's) on mine and it does the same thing which is the opposite of what should be happening! Have you heard or seen a fix for this? Its actually putting more mile on the vehicle than are being driven

 

[Desmolicious]

I wouldn’t worry about changes in off set doing damage unless it is wildly different.
Remember the TRD Pro wheels that Toyota sells as an option have greater offset than stock.

 

[6GenChad]

I am on 35x12.5R17 and even with a 35' tire. The odometer hasn't changed or isn't off at all.

 

[NotApplicable]

Here is the manual's guidance about tire sizes. Of note:

• With factory suspension, they do not recommend any tire size other than the manufacturer specified tire sizes
• With Toyota genuine 2.5" lift kit, they recommend up to 3 inches larger tires than the manufacturer specified tire sizes
• They don't recommend anything else, including non-Toyota genuine lift kits

It''s not surprising that they would make these recommendations.

I had no second thoughts about running 265/60R20 because they dimensionally match the 265/70R18 on other trims from factory and the Limited wheels have the same 55 offset as those other trims. Still, this violates these recommendations because 265/60R20 is not one of the manufacturer specified tire sizes.

Re: warranty issues, they'd have to prove that you violating these recommendations caused a given issue.

 

[mars001]

How could it possible that the speedometer shows a speed that's faster than the actual speed? With bigger tires, shouldn't it show a lower speed as the tires now turn at fewer revolutions for any actual speed?

I have 34s (Came with 33's) on mine and it does the same thing which is the opposite of what should be happening! Have you heard or seen a fix for this? Its actually putting more mile on the vehicle than are being driven

 

[mars001]

That's magic! How does the computer know that you now have bigger tires and knows to compensate the display?

I am on 35x12.5R17 and even with a 35' tire. The odometer hasn't changed or isn't off at all.

 

[Franco]

How could it possible that the speedometer shows a speed that's faster than the actual speed? With bigger tires, shouldn't it show a lower speed as the tires now turn at fewer revolutions for any actual speed?

That's the question... I have two other modified vehicles with bigger tires and they both show a slower speed on the speedometer vs GPS as they should.
FYI - It happens to 4Runners with stock tires too so a pre-modification issue. I think 6genchad is saying with 35s his speedo should be slower not equal to GPS

 

[MikeD]

Here is the manual's guidance about tire sizes. Of note:

• With Toyota genuine 2.5" lift kit, they recommend up to 3 inches larger tires than the manufacturer specified tire sizes

Thanks for posting.
Am curious if anyone has found the "Toyota genuine 2.5" lift up kit" referenced in the manual. I've hunted a bit and cannot find it. Googling that phrase from the manual results mostly in the many after-market lift kits that are available.
I've been toying with the idea of a true lift but not at all committed to it. (I've got 285/70R18s on TRD flat black option wheels (+45 offset) on my TRD ORP with the Peak 1.25" level spacer. Tires just fit without rubbing (with crash plate deleted for now). As I do more and more serious off-roading I seek more ground clearance but so far I've not hit an OnX blue trail (up to 6) that I can't handle with current setup. Might want to try a black trail someday though ....

BTW - my speedometer which is spot on when I'm running the OEM 265/70R18s is low by about 3 MPH at highway speeds around 70-75 MPH. (based on GPS speed readings (Waze, etc.) and radar readings on roadside signs when they appear). This is just about what the math says. I'm baffled by comments above that cite 35" tires with no change and even more by having the speedometer and odometer read HIGH with bigger tires. (makes no sense and is inconsistent with my data - so I'm curious why my experience is different). And to be clear - the speedometer has not adjusted after over 2000 miles with the big tires - and I've swapped back and forth so would have seen any adjustment.

 

[Franco]

Thanks for posting.
Am curious if anyone has found the "Toyota genuine 2.5" lift up kit" referenced in the manual. I've hunted a bit and cannot find it. Googling that phrase from the manual results mostly in the many after-market lift kits that are available.
I've been toying with the idea of a true lift but not at all committed to it. (I've got 285/70R18s on TRD flat black option wheels (+45 offset) on my TRD ORP with the Peak 1.25" level spacer. Tires just fit without rubbing (with crash plate deleted for now). As I do more and more serious off-roading I seek more ground clearance but so far I've not hit an OnX blue trail (up to 6) that I can't handle with current setup. Might want to try a black trail someday though ....

BTW - my speedometer which is spot on when I'm running the OEM 265/70R18s is low by about 3 MPH at highway speeds around 70-75 MPH. (based on GPS speed readings (Waze, etc.) and radar readings on roadside signs when they appear). This is just about what the math says. I'm baffled by comments above that cite 35" tires with no change and even more by having the speedometer and odometer read HIGH with bigger tires. (makes no sense and is inconsistent with my data - so I'm curious why my experience is different). And to be clear - the speedometer has not adjusted after over 2000 miles with the big tires - and I've swapped back and forth so would have seen any adjustment.

Mine came from the factory with the TRD OR Black Wheels and 33" tall tires. Maybe there is some calibration issue with that option package.

 

[MikeD]

Mine came from the factory with the TRD OR Black Wheels and 33" tall tires. Maybe there is some calibration issue with that option package.

I realized that I was unclear above: my speedometer is spot on (per GPS etc.) with OEM 265/70R18 (32.6") tires. Its low - as expected! - with the bigger 285/70 (33.7") tires. So, no calibration issue on speedometer for me. (And apologies for the confusion in my post above)

 

[Franco]

I realized that I was unclear above: my speedometer is spot on (per GPS etc.) with OEM 265/70R18 (32.6") tires. Its low - as expected! - with the bigger 285/70 (33.7") tires. So, no calibration issue on speedometer for me. (And apologies for the confusion in my post above)

Yes copy that. That's the way it should work! hahaha

 

[6GenChad]

That's magic! How does the computer know that you now have bigger tires and knows to compensate the display?

Above my pay grade not to care, its 2025. I'm sure their tech is advanced enough. Neither of us knows though, so who cares.

 

[6GenChad]

That's the question... I have two other modified vehicles with bigger tires and they both show a slower speed on the speedometer vs GPS as they should.
FYI - It happens to 4Runners with stock tires too so a pre-modification issue. I think 6genchad is saying with 35s his speedo should be slower not equal to GPS

It's accurate though, one of the first things I tested. Among using Waze, it matched my speedometer.
Bonus - I got pulled over going 80 on the freeway (which I was going) and the cop said his radar gun clocked me at that, so who knows.

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