DaytonaGTP
Its not that small is it?
I love lettered tires, kumho makes some 17's in 50 series i believe with letters. The paint though fades really fast. I used it on my sportbike and had to redo it about every 2 months or so, no matter what i used to clean it, even just water made it fade and hardly stand out.
any auto parts store would have what they call "hot tires" paint for tires. these apply really well. i used them on the tires of my old truck and they took quite a beating for 2 years and they never faded.