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X-GlideR chainrings The chainrings in combination with the Yaw derailleur ensure optimum shifting performance. The stiffer blades (5 mm, aluminium 7075-T6, CNC-machined) have shifting pins in a modern design adopted from SRAM XX. CNC machining enables precise control of every tooth shape, every climbing aid and almost every shifting function of the chainring. Chainrings, chain and front derailleurs form an integrated system for optimum performance.