245/40ZR17 Kumho Ecsta PS31 Summer 91W Passenger TireKumho Ecsta PS31 245 40ZR17 91W OVERVIEW The Kumho Ecsta PS31 is a performance tire that's designed for use on passenger vehicles in warmer weather conditions and features a 3D dimple design that minimizes heat build up and enhances high speed durability. Four wide grooves drain water from the tread to reduce the risk of hydroplaning on wet roads, and the Ecsta PS31's solid center rib and lateral grooves keep the tread blocks stiff to increase