Hello, I have the original Michelin tires on my 02' Honda accord Lx with 18,000 miles on it. The front tires are showing uneven tread wear. I am seeing several brown lines on the front tires. Is that a sign of wear? Anyways, I was wondering if these would still be under warranty? Do you recommend getting new Michelin tires or other brands ? And if there is any kind of proration on the cost, let me know ? Thank you very much.