I have 12k miles and haven't rotated tires yet. Waiting for my 1st year service to do the rotation. Unfortunately I got a nail in the driver side rear tire recently and got a new tire. I have no idea if I should rotate the tires now. I haven't measured tread depth on the existing tires but visually the rear tire is slightly lower than the fronts. Seems like I should keep the new tire in the rear. Should I just rotate the passenger side tires?