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tire size change=speedometer problem?

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

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

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    wawuzit [OP] Well-Known Member

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

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    here4cake Well-Known Member

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    Install a speedometer calibrator.
     
    here4cake, Jan 30, 2019
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  3. Jan 30, 2019 at 6:28 PM
    #3
    Brent2014

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    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.
     
    Brent2014, Jan 30, 2019
    #3
    TacoCasa and Boghog1 like this.
  4. Jan 30, 2019 at 6:29 PM
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    here4cake

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    here4cake Well-Known Member

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    here4cake, Jan 30, 2019
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  5. Jan 30, 2019 at 6:32 PM
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    wawuzit

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    wawuzit [OP] Well-Known Member

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

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    Brent2014 Well-Known Member

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    Brent2014, Jan 30, 2019
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  7. Jan 30, 2019 at 6:35 PM
    #7
    wawuzit

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    wawuzit [OP] Well-Known Member

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

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    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
     
    mynewtoy, Jan 30, 2019
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  9. Jan 30, 2019 at 8:01 PM
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    Lotin

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    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!
     
    Lotin, Jan 30, 2019
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  10. Jan 31, 2019 at 1:26 AM
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    Anchovy

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    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
     
    Anchovy, Jan 31, 2019
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  11. Jan 31, 2019 at 3:17 AM
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    jsinnard

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    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.
     
    jsinnard, Jan 31, 2019
    #11
  12. Jan 31, 2019 at 4:08 AM
    #12
    runmc

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    runmc Well-Known Member

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

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    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
     
    kgilly, Jan 31, 2019
    #13
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  14. Jan 31, 2019 at 4:47 AM
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    Woodrow F Call

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    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.
     
    Woodrow F Call, Jan 31, 2019
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  15. Jan 31, 2019 at 4:48 AM
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    AugustusJack

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    AugustusJack Well-Known Member

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    AugustusJack, Jan 31, 2019
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  16. Jan 31, 2019 at 4:51 AM
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    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 .
     
    lynyrd3, Jan 31, 2019
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  17. Jan 31, 2019 at 4:52 AM
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    lynyrd3

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    lynyrd3 STRENGTH DETERMINATION MERCILESS FOREVER

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    I’m lifted with 33s ,speedometer is off 3 mph !
     
    lynyrd3, Jan 31, 2019
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  18. Jan 31, 2019 at 5:08 AM
    #18
    wawuzit

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    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.
     
    wawuzit, Jan 31, 2019
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  19. Jan 31, 2019 at 8:50 AM
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    Alesimo

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    Alesimo Jeeper

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

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    SearArtist GX poor

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    So your ODO will show less miles than it actually has, got it. Sounds legit.
     
    SearArtist, Jan 31, 2019
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