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accurate odo after tire swap?

Discussion in 'Wheels & Tires' started by bt08231, Jan 31, 2012.

  1. Jan 31, 2012 at 1:38 PM
    #1
    bt08231

    bt08231 [OP] Well-Known Member

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    I posted about this a few months back and never really got any solid answers.....after swapping 245x75's for 265x75's i have to be travelling a farther distance then my odo is saying correct? When i calculate my mileage it has gotten bad, and i cant imagine a small step up in tire size has cause all this. Does anyone know by what percentage i should be multiplying my miles driven by to get an accurate odo reading?
     
  2. Jan 31, 2012 at 1:45 PM
    #2
    bpkrules

    bpkrules Well-Known Member

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    I have been thinking the same thing.
     
  3. Jan 31, 2012 at 1:47 PM
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    bt08231

    bt08231 [OP] Well-Known Member

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    its gotta be slighly off, a larger tire will cover a larger distance...
     
  4. Jan 31, 2012 at 3:07 PM
    #4
    Discount Tire Direct

    Discount Tire Direct Wheel and Tire Guys Vendor

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  5. Feb 1, 2012 at 10:53 AM
    #5
    bt08231

    bt08231 [OP] Well-Known Member

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    hmm that's an interesting tool, does anyone know how to use this tool to answer my question though? come on i know someone has done this...
     
  6. Feb 1, 2012 at 11:04 AM
    #6
    jhodge83

    jhodge83 Any dog under 50# is a cat and cats are useless... Moderator

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    wat?
    if i'm thinking right, since your tire rotations are 3.7% off, you'd need to multiply your mileage by 1.037. not much, but it is a difference. the weight between sizes makes a difference too.
     
  7. Feb 1, 2012 at 11:09 AM
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    bt08231

    bt08231 [OP] Well-Known Member

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    ok cool that's exactly what i was thinking....just wasn't positive...
     
  8. Feb 1, 2012 at 11:14 AM
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    jhodge83

    jhodge83 Any dog under 50# is a cat and cats are useless... Moderator

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    wat?
    yeah...i'm thinking that's right b/c the difference from a 265/65/17 to a 285/70/17 is 6.6% and around what i was seeing on my ultragauge when i calibrated it at the time.
     
  9. Feb 1, 2012 at 11:23 AM
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    A_Ninja_Racer

    A_Ninja_Racer Well-Known Member

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    Interesting when before I got larger tires my gps always said I was going slower than my speedo did. when I changed to larger tires its they were dead on the same. so I just looked at it is now everything is pretty accurate. I know a lot of aupt makers are making there speedo's say you are going faster than you really are I've seen it on my ninja and on my honda vtx. and we are talking a big difference like 70 mph on the speedo is actually 65. Its like they are secretly trying to slow us down. I have also confirmed this on those radar boxes that tell you how fast you are going.
     
  10. Feb 1, 2012 at 11:26 AM
    #10
    Cowboyz

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    yea 3% is not bad at all. Im running 35s and im off by 12%. Just make sure to calculate this when doing oil changes. when your odo says you have gone 2900 miles you have actually gone over 3000.
     
  11. Feb 1, 2012 at 11:28 AM
    #11
    Pugga

    Pugga Pasti-Dip Free 1983 - 2015... It was a good run

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    You're correct.

    The Discount Tire Direct tool is nice, but the TW calculator is better for this. Plug in your old size for the 'current tire size' then type in your new size and the difference is given to you in % form. For the OP's situation, the percentage should be given to you as 3.7% so take your mileage, multiply by 1.037 and that's the mileage you're actually driving.

    http://www.tacomaworld.com/forum/tirecalc.php
     
  12. Feb 1, 2012 at 11:30 AM
    #12
    jhodge83

    jhodge83 Any dog under 50# is a cat and cats are useless... Moderator

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    wat?
    correct...all of our speedo's fast. the larger tire (depending on size) fixes the speedo issue, but knocks the ODO out.
     
  13. Feb 1, 2012 at 11:35 AM
    #13
    Dustyroades

    Dustyroades Well-Known Member

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    Most tire manufacturers publish revs/mile for their individual tires and sizes. I used these numbers because tires of the same size are not exactly the same size.

    Take the bigger number, divide by the smaller number, and multiply this value by your odo reading.
     
  14. Feb 1, 2012 at 11:38 AM
    #14
    bt08231

    bt08231 [OP] Well-Known Member

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    Awesome! thanks for all the prompt help, now i can breath a sigh of relief when i check my mileage lol.
     
  15. Feb 1, 2012 at 11:38 AM
    #15
    A_Ninja_Racer

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    Yeah but wouldn't you think that if your speedily was wrong your odometer would also be wrong.
     
  16. Feb 1, 2012 at 11:40 AM
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    Rusty 06 4x4

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    I dont know about the taco's but when I changed tire sizes on my Express Van (plumbing vehicle) chevy had to go into the computer to tell it that the tires were a different size so it would read the MPH and stuff correct..just a thought
     
  17. Feb 1, 2012 at 11:44 AM
    #17
    Dustyroades

    Dustyroades Well-Known Member

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    It's not. The speedo is off from the factory but the odo is right.
     
  18. Feb 1, 2012 at 11:52 AM
    #18
    jhodge83

    jhodge83 Any dog under 50# is a cat and cats are useless... Moderator

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    wat?
    the difference is that there is an analog/digital conversion. both ODO and speedo do not get the exact feed straight into it.

    reset the trip on your GPS and ODO, drive any distance w/ the larger tires and the ODO will ready a lower mileage.
     
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