The wheels are IFMAR standardised because of the wheel hex offset. The tires feature countersunk center area that allows the wheel nut to stay deeper within the wheel. The tires are ideal for high-competition racing. They feature interior reinforcement ribs to give stability and resist deformation. The medial side for the wheel is aerodynamic for maximum performance. The wheels had been built to offer maximum traction. The tires function a 12mm interior hex. Yellowish color group of 10 (5 set)