Thanks Chip, Wait4...
I gonna check the warranty, it's a stock one (well not stock but replaced by the dealer after failing into a hole, both right side tires blew and the rims were broken on jan 2004).
I was checking prices and brands (i think those goodyear aren't that good) the Bridgestone Potenza S03 grabbed my attention but omg!
US$320 for a single tire??? i think that's a lot of money!
Tire shooping time!!
Thanks a lot again amigos!