Additional Information Hankook TH31The 3PMS-certifie Hankook Smart Flex TH31 is an all weather tractor/trailer tire for variable road conditions.HighlightsMain zigzag groove provides excellent traction and water drainage under various road conditionsAsymmetric grooves helps eject stonesSlanted groove design helps to prevent chunkingLateral semi grooves help improve initial traction performanceSpecial chip-cut compound to enhance durability for severe conditions