The Optimas came with either 17" or 18" tires from the factory. The early models had a Hankooks line which was super noisy. Newer models have other brands which are far greater. ANY tire as it wears increases road noise. There are a couple stickied wheel threads here in the Forums, have you gone through them?
As for brands, there are a lot of Yokohama fans here (me included), as well as Continental, and I just recently purchased a set of 19" Nexen NFera AU7's which are pretty nice as well.
As for brands, there are a lot of Yokohama fans here (me included), as well as Continental, and I just recently purchased a set of 19" Nexen NFera AU7's which are pretty nice as well.