SRAM RED eTap 11 Speed WiFli Rear DerailleurEnjoy reliable wireless shifting performance with the 11 Speed WiFli Rear Derailleur from SRAM. Designed with a bigger cassette size than their previous model, this component is the ideal choice for cyclocross (CX) or gravel riding. SRAM’s own wireless technology provides a secure connection and the removable battery has a 1000km range. So, if you forget to top up your battery and it runs low miles from home, simply swap it over with the front derailleur’s battery to get back on the road with a full cassette range. This rear mech also benefits from the same quality construction of the mechanical SRAM Red version, featuring ceramic pulley bearings, a carbon cage, and an anodised alloy body.Features:Wireless connection via AIREA network for a fast and clean installationSimple clip-on, clip off removable battery (swappable with front derailleur-battery not included)Cage Length/Type: ShortCage Material: CarbonSpeed: 11 SpeedRear Derailleur: SRAM Red eTapPulley Bearings Material: CeramicMaximum Tooth: 33Compatibility: SRAM 11-speed compatible, 32 teeth maximum capacity, designed to work with SRAM PowerGlide and PowerdomeX cassettes, only compatible with SRAM RED eTap shift/brake controlsPart Number: RD-RED-E-A2Please Note: Battery not includedTechnologies:AIREA: Utilising 128-bit encryption, eTap® shift signals are transmitted and received in accordance with SRAM’s proprietary wireless protocol known as AIREA. Each time an eTap groupset is paired, a new encryption code is generated and assigned to the components in this group to ensure complete shifting security.eTap: All of the underlying technology in our new SRAM RED eTap groupsets, such as wireless shifting, advanced battery power management, and mechatronics technologies, are meant to serve one ultimate purpose: to facilitate the most intuitive and consistent shifting available. This shift logic is called eTap. The right lever makes it harder, the left lever makes it easier, both levers shift the front derailleur. Simple, unmistakable, and intuitive.X-Sync: SRAM X-Sync 1x chainrings provide the highest level of performance and durability. The SRAM X-Sync tall square teeth edges engage the chain earlier than traditional triangle shaped teeth. The sharp and narrow tooth profile, as well as rounded chamfer edges, help manage a deflected chain. To provide the best possible performance in muddy conditions, the X-SYNC chainrings have been designed with mud-clearing recesses for the inner chain links and rollers. Engineered in Germany, X-SYNC rings are an integral part of the SRAM 1x drivetrain. Accept no imitation.Orbit: Orbit technology is an innovative new form of derailleur motion control. It utilizes silicon fluid as part of an elegant and ultra-lightweight damper system. Compared to a standard friction clutch system, Orbit technology places no additional resistance on the rear derailleur’s spring when under slow or light movement. This means easier shifting and rear wheel removal. And while riding, the fluid damper reduces chain bounce. It’s rock-solid reliability for both 1x and 2x systems.WIFLI: WiFLi = Wider – Faster – Lighter. SRAM’s WiFLi technology is based on the compact 2 x 10 or 11 – two front chainrings and 10 or 11 gears in the rear – design inherent in SRAM RED 22, Force 22, Rival 22 and Apex, which delivers a wider range of gears, up to 11-32, than your standard triple, faster shifts through two chainrings and every gear on the rear cassette, and with significant weight savings. WiFLi cassettes are also available for Force CX1.Buy SRAM Components from Chain Reaction Cycles, the World’s Largest Online Bike Store.