The wheels are IFMAR standardised due to the wheel hex offset. The tires function countersunk center area which allows the wheel nut to keep much deeper inside the wheel. The tires are well suited for high-competition race. They function interior reinforcement ribs to offer security and resist deformation. The medial part for the wheel is aerodynamic for optimum performance. The tires was indeed built to provide maximum traction. The tires function a 12mm inside hex. Yellowish color group of 10 (5 set)