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Old 06-22-2007, 03:38 PM   #1
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Tire Size

I put 14 inch tires from an integra on my crx. How does this effect my odometer reading?
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Old 06-22-2007, 04:52 PM   #2
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Probably makes it incorrect.

You have to know the previous size and the new size, and compare it. Do a search on this site for "miata" and you'll find a tire size calculator.
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Old 06-23-2007, 10:12 AM   #3
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Thanks that helps alot heres the url for anyone else searching: http://www.miata.net/garage/tirecalc.html




now I have to change my garage entry to reflect the difference.
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Old 06-23-2007, 10:20 AM   #4
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My 90 CRF HF has 14" rims with 185/60/14 tires. I used this http://www.discounttire.com/dtcs/infoTireMath.dos calculator and got an approximate 5% difference between the stock size.

I then measured a 28 mile distance on Google Earth between 2 exits on the freeway on my commute and found that with the 14" tires I was within 1/10 mile accuracy. From this I'm assuming the odometer with the stock sized tires is a few % high.
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Old 06-23-2007, 10:23 AM   #5
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Quote:
Originally Posted by mrmad View Post
My 90 CRF HF has 14" rims with 185/60/14 tires. I used this http://www.discounttire.com/dtcs/infoTireMath.dos calculator and got an approximate 5% difference between the stock size.

I then measured a 28 mile distance on Google Earth between 2 exits on the freeway on my commute and found that with the 14" tires I was within 1/10 mile accuracy. From this I'm assuming the odometer with the stock sized tires is a few % high.
using the miata page, the difference between my stock 175/70/13s and the 185/65/14s was 3.6%. I wonder why it isn't the same on the discounttire page.
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Old 06-23-2007, 10:26 AM   #6
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are you using a size other than 175/70/13 as stock?
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Old 06-23-2007, 10:50 AM   #7
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I never had the stock size, the car came with 14" rims with the 185/60/14 tires. According to tirerack.com, the stock size of a 90 CRX HF is 165/70/13.
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Old 06-23-2007, 10:53 AM   #8
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Ok, I was just going by what was on my 90 crx. I'll have to checkout and see if the std. size for 88 is different and adjust my mileage again.
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Old 06-23-2007, 10:58 AM   #9
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double checked everything, with my 185/65/14s I'm driving 6.2% further than odometer reading. thanks mrmad.
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Old 06-23-2007, 11:01 AM   #10
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double checked everything, with my 185/65/14s I'm driving 6.2% further than odometer reading. thanks mrmad.
That's what I was assuming, but if my measurements using Google Earth were accurate, it seemsmy 90 is now about spot on in odometer readings with the 185/60/14s. This makes me think the stock odometer with the stock tires reads high.
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