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  1. #1

    Question Larger tires and speedometer/odometer variation

    With larger than stock tires installed on my Colorado the speedometer is 4-5 MPG less than actual at speeds of 65-75 MPG (checked with GPS).

    How does this affect the odometer? Am I putting more miles on my truck than actual??
    2006 Colorado 3.5L I5 Z71 4x4
    AEM Cold Air Intake
    2" Add-A-Leaf w/ 2" torsion bar key lift
    Rancho shocks all the way around
    31 x 10.5" BF Goodrich T/A KO w/ Black letters out
    15" American Racing ATX Mojave Teflon coated rims
    Flowmaster Super 44 exhaust
    Alpine PDX 4 x 100w amp
    Alpine iDA-x305 iPod control deck
    Alpine IMPRINT Audio processor
    Diamond Audio 6.5" comps (4) w/ custom install tweets
    200 sq. ft. of FatMat sound deadening material

  2. #2

    Default

    Hmm, your wheels have a larger circumference, so they are traveling further per every rotation of the wheel, so I think your odometer would actually read less?

    EDIT: So yes, if your wheel circumference got 10% longer, you will have traveled 110 miles when your odometer says you've been 100. Would probably throw off your DIC readings too. Wonder if that can be adjusted..?
    Last edited by daweinah; 10-23-2009 at 02:52 AM.

  3. #3

    Default

    Yes this can be done by changing the gear in i think the transfer case to match the size of your new tires.


    1995 Chevy Silverado
    Fully loaded!!!
    4Wheel Drive
    5.7 Liter
    Blue
    Best Engine In The World!!!!!
    Once i had a nearly dead battery and was only able to get 1 slow crank per attempt, Once to the fifth crank she fired up! (True Story)
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  4. #4

    Default

    I believe you can also modify the ECU to compensate for larger tires by changing shift points as well as speedo/odo readings??

    Charlie
    XS ive1:(^^^)
    2008 Silverado Crew LTZ Southern Comfort conversion
    SoCo cat back duals
    Volant CAI
    6" Pro-Comp lift
    ARE cap with Yakima rack system (winter)
    GM Hard tri-fold tonneau (summer)
    GM rear wheel liners

    XS ive2:(avatar)
    2014 Silverado 2500HD CCSB LTZ Z71 6.6 DMax/Allison
    6.5" BDS 35" Nitto Trail Grapplers
    LineX/wheel liners/OEM tube steps/sunroof/slider/mirrors/Nav/cablights/trifold tonneau

    Getting the toys to the track with a 2007 Roadmaster 7X12 V-Nose 7k tandem "Mobile Man Cave".

  5. #5

    Default

    You can adjust for the tire size (and gear size if you ever change gears) with a hand held tuner. I used a hand held tuner to adjust my speedo for my 35 inch tires and my gear change from 3.73 to 4.56. I used a garmin and kept adjusting with the hand held until my speed was dialed in perfect.

    Bobby - North Carolina
    2008 4x4 5.3L V8
    6" Suspension Lift and 1.5" Body Lift
    20x9 Ballistic Jesters w/35" Toyo Open Country MT's & 1.5" rear wheel spacers
    4:56 Yukon Gears
    Hypertech Speedometer Calibrator
    Baja style bed mount spare tire carrier
    Flowmaster 40 series dual exhaust
    Recon Smoked LED tails/3rd brake lights/black projectors w/switchback LED's in the corners
    N-Fab Nerf Steps
    K&N CAI
    No Fear Pedals
    Tint, Line-X bedliner, Window visors, Rear wheel well liners
    Painted front grill, bow ties and door badges, de-"lettered" tailgate
    Powder coated front and rear bumpers

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