ok i want to get alittle bit bigger tire so what about the maxxis buckshot 275 or bfg a\t 285??? are they the same size??? is the maxxis 275 bigger than my stock tires??? and should i save up more money and go bigger???

 

Check out this tire size calculator to give you an idea on size. The metric thing always confused me too. This compares your stock or current size to the new size (or the size on your wish list).

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

Hope this helps.

The graph is kinda cool.

 

dont go bigger than 33" tires unless you plan on getting new gears and getting your speedo recalibrated. You will wear down your tranny over time if you dont get proper gearing. You can easily fit 35" tires with a 2.5" leveling kit. I wouldve loved to fit 35", but I really didnt want to pour in the cash for new set of gears.