the bolt pattern on our cars is 5X114.3 so it has to have that pattern
the information below should give you what you need to know about the wheel offsets and the tires sizes you can use with that offset. also if you will go to this site
http://www.miata.net/garage/tirecalc.html
its a tire size calculator which will tell you the differences between the stock size tire you have and any size you are considering...it will give you the differences and tell you how much your speedometer will be off if any.
this infromation is from Richie at
Automotive R & D
1626 Pomona Ave.
San Jose, CA. 95110
408-947-0505
Tire, Wheel, and Suspension Experts