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TIRE CHANGE

Discussion in 'Chevy Colorado Forum (GMC Canyon)' started by doug, Jul 12, 2006.

  1. doug

    doug New Member

    WHAT ABOUT THE SPEEDO SETTING AFTERWARDS?
  2. hotrodbob

    hotrodbob New Member

    A good speedo repair shop can take care of that
  3. retired2001

    retired2001 New Member 1000 Posts

    Some of the "programers" will also reset the speedometer adjusting for tire size (Hypertech for one).
  4. TRPLXL2

    TRPLXL2 New Member Platinum Contributor 1000 Posts

    In the past I have found that as long as you stay under 2" larger over all size of the original rolling stock you will be fine, If you go over that then you must have it adjusted.
  5. unplugged

    unplugged New Member 1000 Posts

    Using GPS shows that the speedo in my work truck is off by 3% at 70 with just a tire change and no wheel size increase. I'd check with the dealer to see what they charge since it involves nothing more than an update to the PCM. Hypertech works too, but it may be more money than you want to spend.
  6. pmf608

    pmf608 Active Member 1000 Posts

    If i'm not mistaken, the general rule with tires is that you are safe to go +/-3% before you have to have the speedo reprogrammed. in the case of mine, my old tire (now winter tires) are about 6% over, but i just leave it because i know how far they are out. [not sure why a tire shop installed tires this much over size despite knowing the +/-3% thing]. If you do need it reprogrammed, id check with the dealer (unless you plan on buying a programmer - it would give you a reason to get it sooner:great:).
  7. vncj96

    vncj96 New Member 1000 Posts

    I would just muy a programmer so you can change it at will, and even though you wont notice a huge power increase, it is worth the MPG and the better shift points and firming up the shifts for the tranny. I picked up a new Hypertech III for 205 shipped from summit and craigslist in my area is usually loaded with ones for sell as cheap as $75. For me having a suburban, I got a 1.5mpg increase so after three tanks the programmer was payed for, and it also can read codes!!

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