Nexen N'Fera RU5 Radial Tire - 255/55R18 109V Wave and straight groove design optimizes the flow of water and improves hydroplaning performance Enhanced center block stiffness improves handling response during high-speed driving Micro groove design optimizes traction performance in wet and snowy road conditions Second rib on the outside, asymmetrically to the inside, optimizes stiffness and reduces in and out, delivering higher driving stability