The tires are IFMAR standardised along with the wheel hex offset. The tires work countersunk center area that allows the wheel nut to stay much deeper in wheel. The tires are very well suited for high-competition competition. It really works interior reinforcement ribs to offer safety and resist deformation. The medial part in regards to the wheel is aerodynamic for optimum performance. The tires was in reality built to provide maximum traction. The tires work a 12mm inside hex. Yellowish color musical company of 10 (5 set)