I just noticed today after parking with the wheels turned halfway left that there was something unusual about the tires. On my OEM Goodyear Eagle RS-A's tires upfront (I didn't inspect the rear) there is a red and green line that runs through the thread in the middle... wear lines??? There is still thread on top of it but in some parts it can be seen through the middle of the thread and between them there is a continuing line of red and green. I noticed this on both tires.... isn't 850 miles and 4 weeks a little quick for brand new tires to wear? Should I call the dealer or Goodyear, or is it like that?