anyways...i dont really know anything about tires and suspensions of cars. i read up a lot about turbos and exhausts etc on clubsi...but nothin much about this stuff...anyways i was wonderin what these numbers about tires mean. for example these are on the evo 7 235/45 ZR17. wuts the 235/45 mean. i know the 17 is the size...17 inches...but whats the zr? the brand?