Wheels and Tires upgrade to 18"

[ekam]

^Also it's because you're putting more tire on the ground which slows it down in exchange for increased traction.

For wheel up-sizing you have to be aware of the appropriate tire size, wheel bolt-pattern, width and offset.

TireRack.com have a lot of great info on wheel/tire upgrade.

http://www.tirerack.com/about/techcenter.jsp

Offset:
http://www.tirerack.com/wheels/tech/techpage.jsp?techid=101

Tire Size Calculator:
http://www.miata.net/garage/tirecalc.html

[RobZ]

FWIW, I upgraded to 18x10 and 18x8.5 about a week after buying my Box. I went through TireRack.com and have once again been very satisfied with the cost, selection, and quick delivery.