Well I ran across this site for calculating tire sizes. I'm always wondering about what size fits what and what width and ratio works here and there , so here it is just plug in #s and its like magic. Later. euroshina.com.ua/calc.php?lng=en

 

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This is the best one I've found: http://www.miata.net/garage/tirecalc.html .

 

Not all tires of the "same" size are created equal. The formula for computing theoretical tire size is quite simple but actual tire sizes may vary a bit.

Visit the websites of various manufacturers and search for tables. If none are available, the size calculators will have to suffice.

Examples:

http://www.mastercrafttires.com/html...ger_avenger_GT

http://www.goodyeartires.com/eagle/eagleF1AS_sizes.html

Tire sizes are like shoe sizes. If all shoes were made to the exact same standard, we wouldn't have to wear our good socks to the shoe store.



Cheers!