1,Double X bridge type design: Bridge type design (shift angle) from professional computer software calculation and actual measurement of the player, which reduces the interference between the tooth tip of the chain disc and the chain during speed change, greatly reduces noise and friction, and brings comfortable Variable speed experience. 2,High and small shaft fitting force: The parallel riveting process technology tightly links the links, becoming a more robust connection method today, allowing the chain to withstand the mechanical destructive destructive force under high-speed and sharp gear shift. 3,High rigidity and high wear resistance: Provides efficient pedaling force transmission and stable kinetic energy transmission, allowing riders to win at the starting point, and continuously maintain a high transmission rate. After being measured by professional drivers, the service life can reach general 5 times the chain. 4,Lightweight, mud drain hole design: the precision design of the hollow structure of the inner and outer chains reduces the overall weight without changing the strength. It is a good ideal for the pursuit of lightweight collocation or long-distance riding. 5,High system compatibility: Commonly used in Campagnolo, most road and mountain bike transmission systems on the market. Corresponding to the guide angle design, the symmetrical guide angle of the outer piece of the chain, the guide chain and the chainring and flywheel are more harmonious and smooth when moving up and down the chain, so that the speed change response is quicker and neat. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-YJL official store