What's wrong with the wheels/tires on your car now? Like Will said, I would say rollbar first so you can do your track days. Too bad Miata's are 4 lug, you could borrow a set of my wheels since I won't be using them anytime soon.
But if you do get wheels, I like those K1-TS's the most. Not that our opinions really matter.
But if you do get wheels, I like those K1-TS's the most. Not that our opinions really matter.
