I just had all four of my Discount Tire Brand Pathfinder A/T tires replaced due to premature dry rot. Had a flat tire in my driveway, and discovered a 1/4" crack/split on the side between treadblocks. Check the other three and one other had a similiar split , other two were cracking. D.T. honored my warranty and replaced with Cooper Discovery H/T's. No hassels at all with them. Tires were less than 2 years old, 12000 miles on them. If you have these tires, inspect them ASAP.