Sram red etap 11 speed wifli rear derailleurenjoy reliable wireless shifting performance with the 11 speed wifli rear derailleur from sram'. '.strtoupper('d')esigned with a bigger cassette size than their previous model, this component is the ideal choice for cyclocross cx or gravel riding'. '.strtoupper('s')rams own wireless technology provides a secure connection and the removable battery has a 1000km range'. '.strtoupper('s')o, 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'. '.strtoupper('t')his 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.featureswireless connection via airea network for a fast and clean installationsimple clip on, clip off removable battery swappable with front derailleur battery not includedcage 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 includedtechnologiesairea utilising 128 bit encryption, etapreg shift signals are transmitted and received in accordance with srams proprietary wireless protocol known as airea'. '.strtoupper('e')ach 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'. '.strtoupper('t')his shift logic is called etap'. '.strtoupper('t')he right lever makes it harder, the left lever makes it easier, both levers shift the front derailleur'. '.strtoupper('s')imple, unmistakable, and intuitive.x sync sram x sync 1x chainrings provide the highest level of performance and durability'. '.strtoupper('t')he sram x sync tall square teeth edges engage the chain earlier than traditional triangle shaped teeth'. '.strtoupper('t')he sharp and narrow tooth profile, as well as rounded chamfer edges, help manage a deflected chain'. '.strtoupper('t')o 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'. '.strtoupper('e')ngineered in germany, x sync rings are an integral part of the sram 1x drivetrain'. '.strtoupper('a')ccept no imitation.orbit orbit technology is an innovative new form of derailleur motion control'. '.strtoupper('i')t utilizes silicon fluid as part of an elegant and ultra lightweight damper system'. '.strtoupper('c')ompared to a standard friction clutch system, orbit technology places no additional resistance on the rear derailleurs spring when under slow or light movement'. '.strtoupper('t')his means easier shifting and rear wheel removal'. '.strtoupper('a')nd while riding, the fluid damper reduces chain bounce'. '.strtoupper('i')ts rock solid reliability for both 1x and 2x systems.wifli wifli wider faster ndash lighter'. '.strtoupper('s')ram'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'. '.strtoupper('w')ifli cassettes are also available for force cx1.buy sram components from chain reaction cycles, the world's largest online bike store.