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Thread: Trying to dial in Speedo.

  1. #1
    Potential Tuner
    Join Date
    Mar 2020

    Trying to dial in Speedo.

    I?m sure this has been brought up but I tried looking and didn?t see any thing that answered my question.
    07 Colorado 2.9, I?ve got larger tires on it and have been trying to dial in my speedometer for the last week or so. Tire measured 30 and 3/4. I have the revolutions per mile set at 645.5 (before I just went off a 31 inch measurement at 651) and I?ve seen virtually no change im still off a couple mph. What am I doing wrong? Thanks in advance

  2. #2
    Advanced Tuner ZeroBoostBuick's Avatar
    Join Date
    Aug 2008
    S.W. Ontario Canada
    Maybe under the EDIT tab there is a Gear/tire wizard. You might have to input the circumference of the new tire.