I have a Hyundai Accent with a set of Hankook 835 tires, (85,000 mile warranty) with about 15K miles on em. Recently, within the last 1000 miles or so, the tires have become noisy, I mean, real noisy. Actually, this was since the last tire rotation. It seems like the noise is coming from the front tires, and one of the front tires is a replacement for a tire that hit a nail, about 2 or 3K miles ago. So there is a younger tire on the front. I've checked the lug nuts to make sure that the wheels were put on properly, I've played with the air pressure. What else can I do or look at? Alignment? The car tracks straight as can be.