Nexen N'Fera RU5 Tires are On Sale and Ship Free! Traction, great handling and strength for all seasons. The tread design of the Nexen N'Fera RU5 incorporates waves, grooves and a micro-grooves to deter hydroplaning as well as improve grip - whether it's raining or snowing. A second outside rib spanning asymmetrically to the inside creates stiffness for greater stability and cornering ability.