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tire size change=speedometer problem?

Discussion in '3rd Gen. Tacomas (2016-2023)' started by wawuzit, Jan 30, 2019.

  1. Jan 30, 2019 at 6:26 PM
    #1
    wawuzit

    wawuzit [OP] Well-Known Member

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    If you go to larger tires what do you do about speedometer error?
     
  2. Jan 30, 2019 at 6:27 PM
    #2
    here4cake

    here4cake Well-Known Member

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    Install a speedometer calibrator.
     
  3. Jan 30, 2019 at 6:28 PM
    #3
    Brent2014

    Brent2014 Well-Known Member

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    A little quick math lol. To my knowledge, there isn’t a fix for it yet. I had a scanner for my Jeep that would adjust the speedo for the gears and tires, but I haven’t found one for the tacoma yet. However, 265/75/16s are just slightly bigger than my stock 16s and it made the speedo dead on.
     
    TacoCasa and Boghog1 like this.
  4. Jan 30, 2019 at 6:29 PM
    #4
    here4cake

    here4cake Well-Known Member

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  5. Jan 30, 2019 at 6:32 PM
    #5
    wawuzit

    wawuzit [OP] Well-Known Member

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    BMWs can be changed with a BMW tech tool. Don't know much about Toyotas.
     
  6. Jan 30, 2019 at 6:33 PM
    #6
    Brent2014

    Brent2014 Well-Known Member

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  7. Jan 30, 2019 at 6:35 PM
    #7
    wawuzit

    wawuzit [OP] Well-Known Member

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  8. Jan 30, 2019 at 6:41 PM
    #8
    mynewtoy

    mynewtoy I like men

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    Mine is off 8% with 35's. I just keep in mind that i'm going that much faster than what the speedo says. It's not a big deal. I definitely wouldn't spend $184 just to make the speedo right
     
  9. Jan 30, 2019 at 8:01 PM
    #9
    Lotin

    Lotin Member

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    Never mind calibrating your speedo, what about changing (screwing up) ALL your gearing. Out friends at Toyota have learnt quite a lot about precise gear ratios, and I tend to trust them. Original diameter tires can be quite effective.... but I’m no mudder!
     
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  10. Jan 31, 2019 at 1:26 AM
    #10
    Anchovy

    Anchovy Rule #1: Never take me seriously

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    Toyota completely botched the third gens from the engine to the transmission to the gearing. Not as refined as the 2nd gen imo
     
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  11. Jan 31, 2019 at 3:17 AM
    #11
    jsinnard

    jsinnard Well-Known Member

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    how big you plan on going? Factory calibration is roughly +/- 5% according to a speed dyno operator I visited after getting a speeding ticket. A +1 tire size increase may actually improve your accuracy.
     
  12. Jan 31, 2019 at 4:08 AM
    #12
    runmc

    runmc Well-Known Member

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    Does the odometer show less miles or more miles with bigger tires? Less?
     
  13. Jan 31, 2019 at 4:40 AM
    #13
    kgilly

    kgilly Well-Known Member

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    going from a stock 245 to a 265 increases the MPH by about 1-2 MPH, if your speedometer is registering 70, it is actually 72, on tire calculator website it shows this information
     
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  14. Jan 31, 2019 at 4:47 AM
    #14
    Woodrow F Call

    Woodrow F Call Kindling crackles and the smoke curls up...

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    The design goals of the average Tacoma buyer probably aren't quite the same as someone who wants to offroad. Besides, you can regear the truck too.
     
  15. Jan 31, 2019 at 4:48 AM
    #15
    AugustusJack

    AugustusJack Well-Known Member

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  16. Jan 31, 2019 at 4:51 AM
    #16
    lynyrd3

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    Get an UltraGauge ,it will give you real mph among a hundred other things ! Mine is set to MPH , Torque converter temp ,engine temp ,RPMs and engine bay air temp .
     
  17. Jan 31, 2019 at 4:52 AM
    #17
    lynyrd3

    lynyrd3 STRENGTH DETERMINATION MERCILESS FOREVER

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    I’m lifted with 33s ,speedometer is off 3 mph !
     
  18. Jan 31, 2019 at 5:08 AM
    #18
    wawuzit

    wawuzit [OP] Well-Known Member

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    I'm not sure but there is a radar read out going into the subdivision I live in. People have been complaining about speeders. The speed limit is 35mph. The new Toyota speedometer reads a perfect match at that speed.
     
  19. Jan 31, 2019 at 8:50 AM
    #19
    Alesimo

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    It really hit my tripmeter. I can't even get to 250 miles on a tank of gas.
     
  20. Jan 31, 2019 at 9:01 AM
    #20
    SearArtist

    SearArtist Hybird

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    So your ODO will show less miles than it actually has, got it. Sounds legit.
     
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