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How to adjust speedometer for larger tires?

Discussion in '1st Gen. Tacomas (1995-2004)' started by Killer, May 31, 2010.

  1. May 31, 2010 at 5:03 PM
    #1
    Killer

    Killer [OP] Well-Known Member

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    How can I adjust the speedometer for larger tires? Can I do it myself, tire store or do I have to take it to a dealership?

    Thanks,

    Killer
     
  2. May 31, 2010 at 5:04 PM
    #2
    jandrews

    jandrews Carolina Alliance Southwest Region Ambassador

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    Mental math is the easiest method...calibrate next to a GPS or something.
     
  3. May 31, 2010 at 5:05 PM
    #3
    topgun155

    topgun155 Well-Known Member

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    I don't think you can. Or at least I have never heard of anyone doing it. Get a scanguage and adjust it to you tire size.
     
  4. May 31, 2010 at 5:06 PM
    #4
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    This:

    [​IMG]


    Or this:

    [​IMG]
     
  5. May 31, 2010 at 5:18 PM
    #5
    Chief10Taco

    Chief10Taco Well-Known Member

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    ^^^^^nice^^^^^

    need to get me one of those
     
  6. May 31, 2010 at 5:23 PM
    #6
    Killer

    Killer [OP] Well-Known Member

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    I need both of them!

    My tires right now are : 32 x 11.5 R 15 LT Steel Radial Mud King XT

    How much bigger are they than stock? How much do you think that the speedometer will be off?
     
  7. May 31, 2010 at 5:26 PM
    #7
    PLC721

    PLC721 Well-Known Member

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  8. May 31, 2010 at 5:26 PM
    #8
    Incognito

    Incognito μολὼν λαβέ

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    What was your stock tire size?
     
  9. May 31, 2010 at 5:28 PM
    #9
    Killer

    Killer [OP] Well-Known Member

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    I don't know what the stock size was. I have owned the truck for about 24 hours and it did not have any paperwork.
     
  10. May 31, 2010 at 6:14 PM
    #10
    mlittle

    mlittle T O Y O T A

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    Look at the label on the side of the door or jam. It will list the stock tire size for your truck.
     
  11. May 31, 2010 at 6:16 PM
    #11
    Jason'sLawnCare

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  12. May 31, 2010 at 6:47 PM
    #12
    Manlaan

    Manlaan Well-Known Member

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    It'll probably be closer to true speed now than it was before.
     
  13. May 31, 2010 at 6:53 PM
    #13
    Killer

    Killer [OP] Well-Known Member

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    Factory Tires (according to door sticker) = P225/75/R15

    I know the 15 is referring to the rim size but, I need to research the other numbers.
     
  14. May 31, 2010 at 6:55 PM
    #14
    Jason'sLawnCare

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    225 mm wide and 75% of the width in side wall so 169ish mm side wall height.
     
  15. May 31, 2010 at 7:15 PM
    #15
    pittim

    pittim mittip

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  16. Jun 1, 2010 at 6:15 AM
    #16
    devilsalmostfree

    devilsalmostfree Well-Known Member

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    thats what my sticker says too, but it came with 265/75/15's.
     
  17. Jun 1, 2010 at 9:31 AM
    #17
    Space Wrangler

    Space Wrangler Well-Known Member

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    if your truck is like mine, it will be dead-on with 32" tires.
     
  18. Jun 1, 2010 at 1:08 PM
    #18
    crazyasu45

    crazyasu45 Well-Known Member

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    Tire caculator says my speedo should be way out...Hooked up my GPS...It's reads 53 kph when my speedos at 50 kph...So I guessing my Taco must be calibrated already to accodate for my larger tires :D

    50 mph 57.81 mph
     
  19. Jun 1, 2010 at 1:56 PM
    #19
    Manlaan

    Manlaan Well-Known Member

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    Its actually calibrated to never show you're going faster (from the dealer) than the speedo shows, as per U.N. Regualtion No 39 and US Motor Vehicle Regulation No 25. The US Regulation allows a 5% margin, which the manufacturers take full advantage of due to heavy fines if the speedo shows you're not speeding when you are actually are.

    Speedo's are never calibrated for true speed, but for true speed minus a margin (2-3% would be my guess).

    So, when you put on larger tires, you're actually getting closer to true speed, until you go over the margin. 32-33's should end up being pretty close to true speed for most of us.
     
  20. Jun 1, 2010 at 2:01 PM
    #20
    Dark Knight

    Dark Knight Well-Known Member

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