Results 1 to 3 of 3

Thread: Double check Tire/size tune

  1. #1
    Tuner in Training
    Join Date
    Mar 2006
    Posts
    11

    Double check Tire/size tune

    Can someone double check my tire size tune? I had the height at 30.6 but I could be off and seems like the speedo is off.

    Thank you
    v/r

    Tune Linked below


    <http://www.hptuners.com/forum/showthread.php?49100-99-Silverado-Radio-settings-keep-resetting&p=365304#post365304>

    Tire - Nitto Terra Grappler
    265/70/16 112S 200960

  2. #2
    Tuning Addict 5FDP's Avatar
    Join Date
    May 2012
    Location
    Rogers, MN
    Posts
    13,533
    That tire size is 30.6, so if you put it in there it should be right.

    Did you auto scale the trans files when you did it??
    2016 Silverado CCSB 5.3/6L80e, not as slow but still heavy.

    If you don't post your tune and logs when you have questions you aren't helping yourself.

  3. #3
    Senior Tuner
    Join Date
    Jun 2004
    Location
    405
    Posts
    2,287
    Use a tire size calculator to compute the stock tire size and the new tire size. Add or subtract the difference between the two sizes to the size in the stock calibration. This is a more accurate way of calibrating the speedometer. Stock tire size height in the calibration will almost always be smaller than what a tire size calculator says.