Hankook Vantra Trailer Smart Flex TH31 Tires feature zigzag groove for excellent traction and water drainage, and also have asymmetric groove that ejects stones. The Vantra Trailer Smart Flex TH31 also have slanted groove that prevents chuncking. Other great features include improved bead structure that enables minimum bead mobility for enhancing durability. Plus, the IMS or Innovation Mixing System minimizes disconnection of polymer chains and oxidation. These Vantra Trailer Smart Flex TH31 Tires are durable and long-lasting under heavy loads.