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  #1  
Old 08-09-2011, 04:23 PM
MADDOG MADDOG is offline
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Default Determining Speedometer Error Due To Tire Size Change

When you change tire sizes, you will experience some speedometer error. Indicated speed may not be your actual speed.

So, if you are curious about how big of a change you will experience, go here:

Speedometer Error Calculator

Then, plug in your stock tire size (or your current tire size if you have adjusted your PCM for this using a programmer) and the new tire size to see what the change will be.
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Old 08-09-2011, 05:00 PM
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http://www.1010tires.com/tiresizecalculator.asp
That is the tool I like to use as well. It has other handy calculations along with your percent difference of tire sizes
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Old 09-14-2011, 07:04 PM
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Default Already swapped tires?

For those of you who have already swapped tire sizes before using one these handy calculation tools, get a gps unit, most will tell you exactly what your true speed is.
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Old 09-25-2011, 10:12 AM
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good stuff, i also use my garmin!
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Old 10-13-2011, 09:56 AM
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is there no way to calibrate the tire change in the computer?
what are the ramifications of going from 20 to 17?
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Old 10-13-2011, 10:43 AM
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A programmer (Predator/Trinity) can be used to change the tire size in the PCM.

As far as going from 20" to 17"- lots of factors to consider, but the main ones are overall tire diameter, rim/tire weight, and rim offset (aftermarket rims). You can go from a stock 20 to a 17, keeping the overall diameter the same, and you'll have no problems.
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Old 05-02-2012, 01:42 PM
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Quote:
Originally Posted by SeattlePete View Post
A programmer (Predator/Trinity) can be used to change the tire size in the PCM.

As far as going from 20" to 17"- lots of factors to consider, but the main ones are overall tire diameter, rim/tire weight, and rim offset (aftermarket rims). You can go from a stock 20 to a 17, keeping the overall diameter the same, and you'll have no problems.
Would a dealership or garage do this re-calibration for you?
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Old 08-29-2012, 10:27 AM
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Quote:
Originally Posted by DrumMedic View Post
Would a dealership or garage do this re-calibration for you?
Curious about this as well
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Old 08-29-2012, 10:31 AM
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Dealership can for a price but you 11-12 folks can purchase the Hypertech which can be used to calibrate your speedometer per tire metrics.
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Old 08-29-2012, 02:29 PM
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Interesting to know. I didn't think there was anything you could do with a programmer. But then again, if the dealer can do it, there's got to be a way. Now to find someone local lol
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