I guess you could install the appropriate speedo gear but I never worried about it on mine. Mine seems to be off by more than that maybe 8-10% but I just make the mental adjustment.

I've been using this one

http://www.1010tires.com/TireSizeCalculator.asp

Thanks Nate, good one. The tabular data & graphics were cool. Too bad I couldn't save it all on my hare drive. Maybe I'll come up with something later.

thx

Thanks Nate, good one. The tabular data & graphics were cool. Too bad I couldn't save it all on my hare drive. Maybe I'll come up with something later.

thx

I have used the following URL and you can save the html code local and use local

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

Don't want to hijack this thread, but can anybody tell me the diameter of the two stock size tires (175R14 and 195R14)?

Tomohawk, Ponchovisa

You can calculate the overall tire diameter in inches using the following formula:

(section width X aspect ratio X 2)/25.4 + wheel diameter(in inches)= diameter

For example: 195/70R14 would be:

(195 X .7(or 70%)X 2(both sides of tire))/25.4(mm per inch) + 14 = 24.748"

You can use this formula to compare any wheel/tire combination you are considering. (Width, offset and backspacing also need to be considered.)

Hope this helps,

Doc.

I found this while looking for vintage tires for a mate

http://www.longstonetyres.co.uk/productPage.php?productID=713&categoryFilename=radial.php

This states that a 175TR14 (not quite a 175R14 but might be the same aspect ratio) is 634 in dia and 172 wide. So using "Doc's 280" formula and working backwards you get (working in mm so changed formula a little)

(section width X aspect ratio X 2) + wheel diameter(in inches)x25.4 = diameter

((diameter - wheel diametre (in inches)x25.4)/2)/section width = aspect ratio

((634-14x25.4)/2/175 = 0.795

so the 175TR14 is equal to a 175/80/14 which from what I have read in other forums is correct. I believe the reason Nissan change from the 175R14 to the 195/70/14 as both have the same rolling dia of approx 630 or 24.8 inches

Hope this helps

My Z is HERE!!!

Tire size on the stock wheels is 185/75R14

Pictures, Nate!!!! I looked at the ones in your gallery, but I know that you can take better ones than those from the seller. (detail shots, etc.)

They're on the way! I got her home and gave her a bath. After that I had very little light left so here is a teaser until I can take more...

Nice! (oh ya, ten charectors)

That is a gorgeous photo Nate. Congratulations!

bfgoodrich radial ta,cooper cobra,yokahama avis s/t,michelin pilot xgt h4,falken ze-502 ziex 502,these are all the tires I could find in 225/60/14 I bought the bfgoodrich because they are the widest of the bunch at 7.2" waiting for them now the falkens are the cheapest in price and cooper is an american owned company made right here in the united states