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Odometer accuracy with different tire sizes?

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Old Jan 23, 2007 | 09:49 AM
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Default Odometer accuracy with different tire sizes?

Non stock tires sizes will alter odometer accuracy. Any formula to figure the correct speed based on new tire size?
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Old Jan 23, 2007 | 09:56 AM
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Originally Posted by smoothsailing
Non stock tires sizes will alter odometer accuracy. Any formula to figure the correct speed based on new tire size?
Let me know the old and new tire size and I'll get you the numbers..

You could also sign up at:

http://www.smokemup.com

and use the calculators
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Old Jan 23, 2007 | 10:04 AM
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Originally Posted by smoothsailing
Non stock tires sizes will alter odometer accuracy. Any formula to figure the correct speed based on new tire size?
http://www.700r4.com/speedoCalc/speedocalc.shtml
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Old Jan 23, 2007 | 11:57 AM
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Originally Posted by smoothsailing
Non stock tires sizes will alter odometer accuracy. Any formula to figure the correct speed based on new tire size?
I do like the way you worded this statement. Alot of people do not realize, you adjust gears for odometer accuracy, not speed. The gears determine the odometer, then the head is calibrated to the correct cable speed.
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Old Jan 23, 2007 | 01:15 PM
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This site will tell you exactly what will happen:

http://miata.net/garage/tirecalc.html
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Old Jan 23, 2007 | 01:23 PM
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I like this tire size calculator:

http://www.miata.net/garage/tirecalc.html

With all the info it gives you, they also include a little note below:

Speedometer reading with non-stock tire is 23.5% too fast. When your speed reads 60mph you are actually travelling 45.9mph
This is exactly the info you are looking for!
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Old Jan 24, 2007 | 10:13 AM
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The tires I'm running now are 265/50/15 on stock rims. Thanks for any info.
Ed
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Old Jan 24, 2007 | 12:47 PM
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Default Gps

I like to check the speed with a handheld GPS. Nothing like ground truth.
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