The wheels are IFMAR standardized with the wheel hex offset. The wheels feature countersunk center area allowing the wheel nut to sit deeper into the wheel. The tires are perfect for high-competition racing. They function interior reinforcement ribs to give you security and resist deformation, yet these are typically produced from a flexible material to give you durability and withstand impacts. The medial side regarding the wheel is aerodynamic for optimum performance. The tires were designed to offer maximum traction. The wheels feature a 12mm internal hex. Group of 10 (5 set)