Odometer accuracy with different tire sizes?
Jan 23, 2007 | 09:49 AM
Thread Starter
Pro
Joined: Jul 2003
Posts: 649
Likes: 2
From: Red Bank NJ
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?
Jan 23, 2007 | 09:56 AM
Team Owner
Joined: Jul 2001
Posts: 182,997
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From: Lakeland, FL
Cruise-In IV-V-VI-VII-VIII Veteran
St. Jude Donor '03, '06, '17
Quote:
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
Jan 23, 2007 | 10:04 AM
Le Mans Master
Joined: Dec 2006
Posts: 8,837
Likes: 1,028
Quote:
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
Jan 23, 2007 | 11:57 AM
Le Mans Master
Joined: Dec 2006
Posts: 8,837
Likes: 1,028
Quote:
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.
Jan 23, 2007 | 01:15 PM
Jan 23, 2007 | 01:23 PM
Team Owner
Joined: Jul 1999
Posts: 26,545
Likes: 46
From: Huntersville NC
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:
Quote:
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!
Jan 24, 2007 | 10:13 AM
Thread Starter
Pro
Joined: Jul 2003
Posts: 649
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From: Red Bank NJ
The tires I'm running now are 265/50/15 on stock rims. Thanks for any info.
Ed
Jan 24, 2007 | 12:47 PM
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From: Finly IN
Gps
I like to check the speed with a handheld GPS. Nothing like ground truth.
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