A super-grip wheel design, the concave lips compress with weight, hugging the ground like claws. The most you'll ever lean into a turn with confidence!   Roundhouse Concave Wheels give you extra projection out of your turns so you can complete maneuvers you’d otherwise slide out on. The key to this design is the concave riding surface which, when under weight, produces an hourglass-shaped contact patch. This increases the surface area and pushes the lip into the ground, creating more grip than ever before while maintaining consistent roll speed. These are the grippiest wheels you’ll ever ride!