Ultra High Performance Asymmetric 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 optimum split surface siping. By increasing shoulder block stiffness, pressure distributes evenly and ensures maximum cornering performance.