The tires are IFMAR standardised because of the wheel hex offset. The tires feature countersunk center area permitting the wheel nut to remain deeper in wheel. The tires are perfect for high-competition competition. They work interior reinforcement ribs to give you protection and resist deformation. The medial component the wheel is aerodynamic for maximum performance. The tires have been built to offer maximum traction. The tires work a 12mm inside hex. Yellowish color group of 2 (1 set)