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speed odometer difference with larger tires

Discussion in '2nd Gen. Tacomas (2005-2015)' started by hillbilly taco, Oct 26, 2012.

  1. Oct 26, 2012 at 4:53 PM
    #1
    hillbilly taco

    hillbilly taco [OP] Well-Known Member

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    3 INCH LIFT 285/75/16 TIRES CUSTOM GRAPHICS ROLL BAR
    does anyone know how much my speedo my be off between factory 245/78/16 to a 285/75/16 I get a little worried in 15mph school zone
     
  2. Oct 26, 2012 at 4:57 PM
    #2
    Highland Logan

    Highland Logan UBIQUE

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  3. Oct 26, 2012 at 4:57 PM
    #3
    TeamSarcasm

    TeamSarcasm Mr. President

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    I think I heard its only 1-2% off, which puts it at the "right" speed. I know my car (and I've read this here as well) it is a few mph above the actual speed.
     
  4. Oct 26, 2012 at 6:06 PM
    #4
    Dilsky

    Dilsky There go my nipples again!

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    It can be a little off. I use my truck for work and check mileage with my gps and it is always higher than the odometer. That being said i would be careful in 15 mph zones but if you are right at 15 probably fine, just don't speed the little bit over you normally do ;)
     
  5. Oct 26, 2012 at 8:46 PM
    #5
    DueNorth

    DueNorth Well-Known Member

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    Use the tire calculator, they'll help some. If you're stepping up from 245's to 285's that's a huge difference and definitely not just a 2% increase...
     
  6. Oct 26, 2012 at 9:02 PM
    #6
    phantomblackgto

    phantomblackgto Well-Known Member

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    GPS is the most accurate way to tell.
     
  7. Oct 26, 2012 at 9:06 PM
    #7
    snorola

    snorola Well-Known Member

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    My truck came with 245's now with 285's im about 9% off according to GPS
     
  8. Oct 26, 2012 at 9:08 PM
    #8
    snorola

    snorola Well-Known Member

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    I think you heard wrong
     
  9. Oct 26, 2012 at 9:09 PM
    #9
    1stacoma

    1stacoma Well-Known Member

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    +1

    I went to 275/70/17 and I'm off by about 5.5 miles for every 100 traveled. I found that my speedo was pretty much the same to my nav before the tires. Now when I am going 67 my nav shows 70 which matches up with the tire size calculator.

    For $200 you can buy this and it will correct your speedo.

    http://www.hypertech.com/products-results.aspx

    Or

    http://www.4wheelparts.com/Performance-Parts/Speedometer-Odometer-Recalibration-Device.aspx?t_c=74&t_s=33&t_pt=6297&t_pl=2708&t_pn=HYP730117
     
  10. Oct 26, 2012 at 9:41 PM
    #10
    DueNorth

    DueNorth Well-Known Member

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    ^^ I was just going to recommend that

    Great product!
     
  11. Oct 27, 2012 at 6:12 AM
    #11
    hillbilly taco

    hillbilly taco [OP] Well-Known Member

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    3 INCH LIFT 285/75/16 TIRES CUSTOM GRAPHICS ROLL BAR
    Gps is a great idea my wife has a portable in her edge i may have to borrow for a couple days thanks guys
     
  12. Oct 27, 2012 at 6:17 AM
    #12
    MrGrimm

    MrGrimm Mall Crawler

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    ^I installed a hypertech unit a couple months ago. Easy install and calibration of the speedometer was not too difficult. First time in six years that my speedometer has been dead on.
     
  13. Oct 27, 2012 at 6:26 AM
    #13
    edm3rd

    edm3rd Well-Known Member

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    Have an 09 with scangaugeII. Have tested with the SG, with GPS, and against mile markers on multiple 100 mile + trips. Stock tires 245/75/16.

    Speedometer reads 2 mph high (62 on dash = 60 on SG and GPS). Speedometer reads higher than the road-side portable radar trailers by about the same.

    Odometer is about 1% low (dash odometer 100 miles, SG, GPS, and mile markers show 101.0 to 101.4 miles).

    Word on the street is manufacturers deliberately have speedometer read 1-2 mph high cause one of them (or more) got sued over speeding tickets claiming they were going faster than speedometer indicated.

    Folks that install taller tires and get the speedometer more accurate may end up with less accurate odometer.
     
  14. Oct 27, 2012 at 9:23 AM
    #14
    1stacoma

    1stacoma Well-Known Member

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    That is good to know I plan on getting one. Where did you purchase?
     
  15. Oct 27, 2012 at 9:36 AM
    #15
    MrGrimm

    MrGrimm Mall Crawler

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    eBay
     
  16. Oct 27, 2012 at 9:46 AM
    #16
    allmotorrex

    allmotorrex Grove St. Motorsports

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    I have that size tires and at 40 my mph isn't even 1 off, maybe like half. That's using GPS and a civic beside me with a digital dash. At 70 its about 2 off. I've had none of the problems that ive read in this thread.

    My 95 single cab is a different story though. With those same size tires my speedo is off 7 mph at 40! Haha its terrible
     
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