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SRAM Red eTap Rear Derailleur 11 Speed Medium Cage model-rip9rdo3-star Look 585 Optimum SmallFrameset -The SRAM RED eTap rear derailleur wirelessly executes shifts the instant you demand. It's easy to set up, clean in appearance and delightfully uncomplicated. Mechanical necessities such as a carbon pulley cage, ceramic pulley bearings, and anodized alloy artfully blend with proprietary electronic advancements to deliver a shifting wonder.