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  1. #1
    Master Mechanic
    lancer's Avatar
    Join Date
    Aug 2009
    Farmersville, Illinois, United States

    Default Speedometer Reset

    Hey guys i'm not sure if this is the right place for this but thought i'd try. I'm putting new tires on my truck and its going to throw off the speedo. Any ideas on the the best way to get it back to normal with the new tire? its an 06 silverado and i'm going from 265x70x17 to a 315x70x17. Is it something i can go and have the computer reprogrammed or something alot more? in all my old trucks i just paced someone and if it said 70 and i was going 50 i just ran 75 on the odometer and new i was around 55. but with this being a new truck i wanna be about right with everything i'm going to do to it.



    2002 Tahoe LT---------TINTED WINDOWS------------7" DUAL DVD INDASH

  2. #2


    you best bet is getting a programmer that has the tire size setup

    gm can/will only program to their stock accessorie tires : IE stock sized tires on 20's and 22's

    05 silverado shortbed

  3. #3


    I used a speedometer re calibrator by Hypertech. It allowed me to adjust for my 35 inch tires and for my 4.56 gears.

    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

  4. #4
    Master Mechanic
    lancer's Avatar
    Join Date
    Aug 2009
    Farmersville, Illinois, United States


    i ran my truck today after i got everything done and going off my gps its exactly 5 mph off. i was worried about getting it reprogrammed but i can live with 5 mph.

  5. #5
    TRPLXL2's Avatar
    Join Date
    Jan 2009
    Norwalk, Ohio
    Blog Entries


    On my last truck I had a pro comp calibrator which I bought for $259, and it was very simple to use. You mark a line on the ground in chalk, and extend the mark onto the tire. Move the truck forward one tire revolution, and measure the distance between the two chalk marks. You punch that into the calibrator, and it automatically compensates the differences.
    2004 Chevy Colorado
    LS1 5.7 swap/TBSS rear axle swap

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