1：The wheel hub -The front and rear hubs are made of7075 aluminum alloy material, the freebody is ratchet system, standard with36 teeth, lightweight design. , 2:Hub: RD13 Ratchet System 36T Center lock 12*100mm.12*142mm，Steel bearing/Ceramic bearing optional 3:use a high speed CNC machine to drill all the holes in our Wheelsets so they are uniform. The spoke and nipple access holes are drilled simultaneously so they match perfectly and have precise angles. 4: After ten years of research and testing materials and materials, ratios, one-piece technology, stiffness increased by 7%. 5：This wheelset is manufactured to UCI standards, if you have any problems within 1000 days of normal use, please contact us and we will work with you to proactively resolve these issues. 1