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Tire size for spedometer calibration

Discussion in 'Toyota Trucks & SUVs' started by sean266, Mar 24, 2011.

  1. Mar 24, 2011 at 6:59 AM
    #1
    sean266

    sean266 [OP] Moderator Staff Member

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    Hello! Newb here with a 09 Tacoma TRD double cab, 5spd auto, rear lockers, a-trac. I'm looking at putting 32" Hancook tires on 17" Procomp wheels here shortly and want to know if I will need to have my speedometer calibrated?? What about gears?
     
  2. Mar 24, 2011 at 7:18 AM
    #2
    Pugga

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

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    http://www.tacomaworld.com/forum/tirecalc.php
    You shouldn't have to regear unless it's for personal preference or for a specific use (towing, off roading, etc). Obviously you'll lose a little power with the larger tires but it won't be a dog. This link will tell you how far off your speedo will be with your new tires.
     
  3. Mar 24, 2011 at 7:26 AM
    #3
    BAMFTACO

    BAMFTACO Pabst Blue Ribbon on ice

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    I'm running 285/75/16 and my speedo is only 3mph off I used my gps
     
  4. Mar 24, 2011 at 9:12 AM
    #4
    David K

    David K Well-Known Member

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    Weird...

    My speedo was off by 3 mph (too fast) with the stock 265/70-16 Rugged Trails. When I put on the 1" taller 265/75-16 Dynapros, it was spot on.
     
  5. Mar 24, 2011 at 11:58 AM
    #5
    Janster

    Janster Old & Forgetful

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    Have you verified your speed with a GPS?

    The speedo that you see on your dash isn't necessarily accurate. I know my computer (ECU) is accurate againest GPS, but the speedometer that I see on the dash is 2mph fast. I have a Scanguage that reads the ECU.
     
  6. Mar 24, 2011 at 3:12 PM
    #6
    sean266

    sean266 [OP] Moderator Staff Member

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    Thanks guys! Are dealerships the only one who can calibrate a speedometer? What would it cost to get that done?
     
  7. Mar 24, 2011 at 4:22 PM
    #7
    David K

    David K Well-Known Member

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    Of course, how else would I know it was off?
     
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