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10-22-2009, 08:43 PM #1
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- Jul 2009
Larger tires and speedometer/odometer variation
With larger than stock tires installed on my Colorado the speedometer is 4-5 MPG less than actual at speeds of 65-75 MPG (checked with GPS).
How does this affect the odometer? Am I putting more miles on my truck than actual??2006 Colorado 3.5L I5 Z71 4x4
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10-23-2009, 02:50 AM #2
Hmm, your wheels have a larger circumference, so they are traveling further per every rotation of the wheel, so I think your odometer would actually read less?
EDIT: So yes, if your wheel circumference got 10% longer, you will have traveled 110 miles when your odometer says you've been 100. Would probably throw off your DIC readings too. Wonder if that can be adjusted..?
Last edited by daweinah; 10-23-2009 at 02:52 AM.
10-23-2009, 03:45 AM #3
Yes this can be done by changing the gear in i think the transfer case to match the size of your new tires.
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10-23-2009, 12:28 PM #4
I believe you can also modify the ECU to compensate for larger tires by changing shift points as well as speedo/odo readings??
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10-23-2009, 04:50 PM #5
You can adjust for the tire size (and gear size if you ever change gears) with a hand held tuner. I used a hand held tuner to adjust my speedo for my 35 inch tires and my gear change from 3.73 to 4.56. I used a garmin and kept adjusting with the hand held until my speed was dialed in perfect.
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