Tire Size

[88HF]

I put 14 inch tires from an integra on my crx. How does this effect my odometer reading?

[Bill in Houston]

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.

[88HF]

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.

[mrmad]

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.

[88HF]

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.

[88HF]

are you using a size other than 175/70/13 as stock?

[mrmad]

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.

[88HF]

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.

[88HF]

double checked everything, with my 185/65/14s I'm driving 6.2% further than odometer reading. thanks mrmad.

[mrmad]

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.

[88HF]

crap, maybe I shouldn't have changed my garage entry. I wonder if its the same VSS for si and hf. Didn't the si have 14" wheels.

[cfg83]

88HF -

I put 14 inch tires from an integra on my crx. How does this effect my odometer reading?

I just tried a GPS and it removed all doubt for me. I had to keep it on the dashboard to give it access to "full sky". Otherwise, it would lose connection to the satelite (and do a "straight line" correction from last known location?). I just used regular commuting miles. 20 and 30 mile segments yielded the same results.

CarloSW2