SRAM RED eTap Rear Derailleur The SRAM RED eTap rear derailleur executes shifts the instant you demand. Wirelessly. 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. Now forwards compatible with 12-speed RED and Force eTap AXS controllers and eTap AXS BlipboxLarger X-SYNC pulleys and ceramic bearings for increased durability and efficiency Features Compatible with existing eTap batteries Updated version of the original SRAM RED eTap rear derailleur Fits all 11-speed SRAM road cassettes up to 11-32t SRAM eTap shift logic and wireless operation Wireless Electronic Shifting The SRAM RED eTap Rear Derailleur uses a completely wireless communication protocol to receive shift commands from the eTap shifters The eTap system features an intuitive shifting logic where the right shifter moves the chain to a harder gear, the left shifter moves it to an easier gear, and pressing both shifters simultaneously shifts the front derailleur. The derailleur is part of the AXS (pronounced “access”) ecosystem, allowing it to connect with other AXS components and be managed through the AXS app. This app enables customization of shifting settings, monitoring battery status, and firmware updates. SRAM’s Orbit technology uses a fluid damper to control the movement of the derailleur cageProviding chain stability without additional resistance. This helps to reduce chain bounce and maintain drivetrain performance on rough terrainThe RED eTap Rear Derailleur is designed to accommodate a wide range of cassettes SRAM RED eTap Rear Derailleur SRAM RED eTap AXS Rear Derailleur SRAM GX Eagle AXS Rear Derailleur SRAM Force AXS eTap Rear Derailleur Customer Reviews 4.7 out of 5 stars 19 3.4 out of 5 stars 14 4.2 out of 5 stars 70 3.4 out of 5 stars 7 Price $629.68$629.68 — no data $339.98$339.98 $307.01$307.01 Speed (FD) 11s 12s 12s 12s Cable pull ratio n/a n/a n/a n/a Cage (RD) Short n/a n/a n/a Max tooth 33 33, 36 52 36 Pulley bearings material Ceramic Ceramic Steel Steel Cage material (RD) Carbon Carbon Steel Aluminum WiFLi WiFLi technology allows for the use of wider range cassettes, typically with larger sprockets than standard road bike cassettes. WiFLi rear derailleurs feature a mid-length cage, which provides the necessary capacity to handle the wider range cassettes SRAM WiFLi technology is compatible with SRAM’s 10-speed and 11-speed road drivetrains X-Sync A technology developed by SRAM for their chainrings, primarily used in mountain biking but also found in some road cycling applications. SRAM X-Sync chainrings feature a unique tooth profile that is specifically designed to enhance chain retention and overall drivetrain performance The tooth profile is characterized by alternating narrow-wide teeth The primary function of the X-Sync tooth profile is to provide better chain retention By gripping the chain more securely, X-Sync reduces the likelihood of chain drops, which can be a common issue in mountain biking when encountering bumps SRAM offers different variants of X-Sync chainrings tailored for various drivetrain setups and disciplines X-Sync chainrings are engineered for durability and long-lasting performance