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SRAM Red eTap Rear Derailleur 11 Speed Medium Cage model-rip9rdo3-star SRAM Rival 22 Rear DerailleurThe 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.