tire size calculator

Here's a great tire size calculator that I use all the time. It's real
handy for looking up tire specs by sizes.
http://www.miata.net/garage/tirecalc.html

 

haha, yeah i found that thing some time last year in my random internet browsing. purdy useful

 

Here is one that I had found a FSC.com forum. I have used it before.
http://www.1010tires.com/tiresizecalculator.asp

 

I got a razor blade in my front tire a while back. it could not be repaired. I ended up buying 2 new tires since the new brand 185/60/15 was not the same physical size as the old 185/60/15.

so that chart is just a close guess.