Nfera Su1 Ultra High Performance Summer. The N’Fera SU1 is your summer tire of choice when navigating through a sudden storm or cruising on a desert road. The tire’s 3 main grooves and 1 semi-groove designs work together to enhance handling in wet conditions. Excellent dry and wet traction are supported by best-fit split surface siping. By increasing shoulder block stiffness, pressure distributes evenly and guarantees maximum cornering performance. *BY request/order.