The SRAM RED E1 Rear Derailleur is SRAM’s most advanced rear shifting system, designed to deliver maximum efficiency, ultra-clean shifting, and race-level reliability across both road and all-road AXS setups. Built for riders who demand absolute precision, it refines every aspect of drivetrain performance, from chain control to shifting response under load. Key Features & Benefits Orbit Fluid Damper Chain ManagementAn integrated damping system stabilizes chain movement, reducing slap and improving retention on rough terrain. This results in quieter operation and more consistent shifting performance in all conditions. AXS Wireless Electronic ShiftingFully wireless architecture eliminates cables entirely, enabling clean cockpit integration, rapid installation, and fully customizable shift behavior via the AXS app. Improved Drivetrain Efficiency PulleysLarger X-SYNC pulley wheels reduce chain articulation and improve mechanical efficiency, helping riders maintain smoother power delivery with less friction. Wide Cassette Range CompatibilitySupports cassettes from 10-28T up to 10-36T, making it suitable for both tight road gearing and wider endurance or mixed-surface setups. Lighter and More Refined E1 ArchitectureThe E1 revision reduces weight compared to previous generation RED derailleurs while improving stiffness and responsiveness for faster, more precise shifts. 1x and 2x CompatibilityA single derailleur platform supports both drivetrain configurations, simplifying inventory and build flexibility for high-end road and gravel bikes. AXS Battery InterchangeabilityUses the standard SRAM AXS battery system, allowing riders to swap batteries between components for maximum convenience and redundancy. Technical Specifications Drivetrain Compatibility: SRAM AXS 12-speed (road and gravel) Max Cassette Range: 10-36T Min Cassette Range: 10-28T Drivetrain Support: 1x and 2x compatible Technology: Orbit chain management system Pulley System: Oversized X-SYNC efficiency pulleys Material: Carbon cage construction with lightweight architecture Shifting: Fully wireless AXS electronic shifting Power Source: SRAM AXS rechargeable battery (interchangeable) Use Case: Road racing, endurance, gravel performance builds
