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  1. #1

    Default after larger tires? for a noob.

    Im sure this has been asked somewhere but i could not find it and Im a noob.

    If i get larger tires what has to be done to correct the speedo and odometer in an 08 silverado? Can the computer be reprogrammed to correct or do you have to get a third party kit to correct it? IF you need a kit which one is the best?

    i just got my new 08 silverado 1500 with 20 in rims...but they come with goodyear eagle ls-2 tires...which are just wrong for this truck. Im looking to keep the factory rim and just put a little more agressive,taller tire on.
    Last edited by Jmill77; 09-29-2008 at 02:47 PM.

  2. #2


    depending how large or a tire you run, it won't be off that much. On my cherokee the stock tire is like a 225 and I'm running a 33 now and its off by 20% but that is a substantial size difference.
    1999 GMC Sierra 2500 350 vortec
    1967 Jeep M725 ambulance 230 tornado
    1990 Cherokee Limited- 3 inch lift on 33's
    ...and every one of em has issues

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  3. #3


    hi, if your truck came with 20's on it stock then the speedo is already set for it. i have the 07 lt1 with 20's but if you want you can go buy a programer and be able to change a few other things on the truck.

    2007 Silverado LT Crew NNBS 5.3
    Stock 20"
    Black Powdercoated Billet Gas Door
    LineX Bedliner
    Go Rhino Dom II Bars
    Work in Progress
    1952 Chrysler 2dr Windsor } Mine and Dad's
    1966 Ford Mustang

    Former Cars
    2000 civic hx Moded
    1993 Probe simi moded
    1985 Nissan 4x4 Kingcab

    So*Cal Group

  4. #4


    you can take it to the dealer and have the computer reflashed, but if u ever change size again the u have to go back and have it done again. im going to buy a programmer to change my size cuz i already know im going bigger next set of tires.
    07 new body silverado, 4.8L, 4x4, ex cab, Pioneer flip out dvd screen, what muffler?, 2" fabtech leveling kit
    Maxxis Buckshot Mudders 285/70

  5. #5


    Thanks for the info... although i doubt I'll be making a lot of changes how much does a good programmer cost? and what brand do people like?
    08 Black Silverado crew cab
    5.3l 4x4 All Star Package
    20in factory wheels
    Line-X bedliner

  6. #6
    Master Mechanic CarpenterGuy's Avatar
    Join Date
    Jul 2008
    Leeds, Alabama


    go to somewhere like Performancecenter website and get you a programmer and you can tell the computer what size tires you got or something. I fit 33's on my truck and there's no lift or level of any sort.
    2006 Silverado Z71 - 97,000 - totaled, RIP
    2006 Silverado Z71 - 122,000 (K&N 77 Series CAI, PowerAid TBS, Magnaflow dual rear exit, 33x12.50 Mickey Thompson MTZ, Tuff Country Torsion Keys, Tuff Country Add-A-Leafs)
    1966 C10 swb stepside (Gen I 350, Turbo 400 trans, dual cyl power brakes, front discs)
    I'll keep my money, guns, and freedom. You keep the Change.

  7. #7
    Master Mechanic CarpenterGuy's Avatar
    Join Date
    Jul 2008
    Leeds, Alabama


    Quote Originally Posted by Jmill77 View Post
    Thanks for the info... although i doubt I'll be making a lot of changes how much does a good programmer cost? and what brand do people like?
    Don't know about brand, but they're typicaly around $200-$400

  8. #8


    so sort of a side note...when some one uses snow tires on their vechicle....they deal with the speedo being off?

    I know to some this might not seem like a big deal but i like everything to work perfectly.

    i think it might drive me crazy. And after getting into this i am thinking i might have two wheel setups that i might want to change out depending on what i am going to be doing.

  9. #9
    Sr. Apprentice smpoulin1's Avatar
    Join Date
    Sep 2008
    Charleston, SC


    You can get a programmer for just tire/transmission settings or if you get one for power changes you can adjust your tire size also. I have been using a Superchips model for a few years. The same unit has worked on all of my trucks from year models 1997 through my 2008. You can update the unit over the internet as needed.

    Steve - South Carolina
    08 Sierra 5.3L
    K&N CAI, Superchips programmer, 30% tint, Lund step bars, Color matched Line-X bed liner, Garmin GPS, Billet Grill, Magnaflow muffler w/GM tip, Kenwood in dash DVD, Back-up camera, Polk audio door speakers

  10. #10


    if the snow tires are the same size as the stock tires they wont be off at all. if you go to a 33, your speedo may be off by 5 mph when going 65. so if your going 65 on the speedo, your really going aroudn 70.
    95 GMC Sierra 2500
    3" Body Lift, 33" Goodyear MTR's
    5.7L 350 TBI Edelbrock SDT Exhaust, Flowtech Headers, K&N Intake
    Sold :(
    1999 Jeep Cherokee, 3" Rustys lift, 33" BFG MT's, locked, armored: Rolled :(
    2000 Jeep Grand Cherokee Limited. K&N Intake, Custom Kolak Exhaust

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