Features: The aluminum alloy core tube is different from the carbon fiber core tube material, the carbon fiber is lighter. Automobile rolling test, anti-impact, strong bearing capacity Climbing force, light weight, fine moisture, fashion. The performance of foot grasping can transmit the force of rider more on treading pedal, so as to reduce the physical loss of human body as much as possible The lubrication of the three Palin structure allows the foot to run easily and freely