Forgive my noobness to s2ki but i am looking into some new tires for autoX. I see in a lot of post people saying f225 and r255. I just wanted to know if they are talking about 255/40-17s and 225/45-17s? I raced my s2000 2 days after i got it and i find i needs a front sway bar and A LOT better tires. (some no name crap on there right now.)

I would get race tires but dont have the cash for them right now, so i am thinking dunlop star Z1 or potenza RE01Rs.

thanks for the halp guys