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18’s on SR5

Discussion in '4th Gen. Tacomas (2024+)' started by JoeVB, Jul 2, 2024.

  1. Jul 2, 2024 at 12:35 PM
    #1
    JoeVB

    JoeVB [OP] Member

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    New to trucks and am wondering if it’s okay to switch the factory 17’s for 18 in wheels on my 2024 SR5.
    I’d like to run 265 / 65 r18 tires on it.
    Any issues with this? Does the Speedo or anything else need to be recalibrated somehow?
    Could this affect the drive train warrantee?
    Thanks.
     
  2. Jul 10, 2024 at 7:48 AM
    #2
    LawTaco

    LawTaco Well-Known Member

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    I have 285-65 18 (33.2) Mickey Thompson baja boss a/t on the black 18" trd wheels it looks good and didn't rub with stock suspension. Then I leveled it with rough country 1.5" level lift (1"spacer) in the front.
    You find out different on speedo on 'Tire size calculator ' website.
     
    Last edited: Jul 10, 2024
  3. Jul 10, 2024 at 8:00 AM
    #3
    JoeVB

    JoeVB [OP] Member

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    Thanks for the info. So you don’t recalibrate the speedometer, you just make yourself aware of what the difference will be?
    Seems like there should be a way to recalibrate the computer since some Tacoma‘s come with 18s and some with 17s.
     
  4. Jul 10, 2024 at 8:21 AM
    #4
    BabyBilly

    BabyBilly Well-Known Member

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    Wheel size doesn't affect speedo, tire size does. If you get comparably sized tires for the 18s you will have the same speedo reading.
     
  5. Jul 10, 2024 at 8:24 AM
    #5
    JoeVB

    JoeVB [OP] Member

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    Right, but the size tire I mentioned in my OP is just over an inch larger than the stock tires.
     
  6. Jul 10, 2024 at 8:25 AM
    #6
    BabyBilly

    BabyBilly Well-Known Member

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    I couldn't have known that since you didn't list your OEM tire size.

    No, you cannot correct for that in the ECU. The 3rd gen had to use a calibration device (https://www.tacomaworld.com/threads/speedo-calibration-on-3rd-gen-tacoma.547766/) but I don't think anything like this exists for the 4th gen yet.

    No, it will not affect your warranty.
     
    lastcall190 likes this.
  7. Jul 10, 2024 at 8:33 AM
    #7
    JoeVB

    JoeVB [OP] Member

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    Ahh, good point. What’s interesting is that the trucks speedometer registers 1 mile an hour faster than a GPS speedometer indicates.
    So adding a tire that’s an inch larger should bring those numbers closer together and actually make the speedometer more accurate.
     
  8. Jul 10, 2024 at 8:37 AM
    #8
    BabyBilly

    BabyBilly Well-Known Member

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    Yeah the factory calibration is usually a tiny bit high so that when your tires are running really low on tread (and are now smaller in diameter) you aren't seeing an incorrect speed.

    FWIW I've got 35s and never recalibrated my speedo. Just remind yourself of the difference every once in a while.
     
    JoeVB[QUOTED][OP] likes this.

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