The wheels are IFMAR standardized with the wheel hex offset. The wheels feature countersunk center area which allows the wheel nut to sit deeper in the wheel. The wheels are perfect for high-competition racing. They feature internal reinforcement ribs to provide stability and resist deformation, yet they are made from a flexible material to provide durability and withstand impacts. The side of the wheel is aerodynamic for maximum performance. The wheels were designed to provide maximum traction. The wheels feature a 12mm internal hex. Set of 2 (1 pair)