Time to save on this SRAM eTap rear derailleur that has been Installed but never used.

SRAM's Red® eTap shifting system is an electronic, wireless wonder in the world of wired electronic systems. Powered by small rechargeable batteries located on the front and rear derailleurs, and controlled via the proprietary SRAM AIREA™ encrypted wireless protocol, the eTap system shifts quickly, with smooth efficiency. This standard cage Red eTap 11 Speed Rear Derailleur is the dominant choice of serious road cyclists and bike racers, as it has a 28T large log limit. SRAM offers a Red eTap WiFli™ option for cyclists who want to expand their range to a 32T cog.

Red eTap is easy to install and set-up- no wires or routing to deal with. Pairing with shifters takes but seconds. Each pairing set-up has a unique 128 bit encryption, so you won't get cross-talk with other bikes. The rear derailleur itself bolts on as any would, then just needs to be set for limits and paired. Technically, 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 instant, impeccable shifting performance.

SRAM applies their Exact Actuation™ system, effectively duplicating the 1:1 ratio electronically, but more efficiently. Along with the Red 22 Chain, the derailleur works flawlessly with SRAM PowerGlide™ and PowerdomeX™ cassettes. The compact, removable battery delivers up to 620 miles (1000 km) of riding per charge, and the front and rear derailleur batteries are interchangeable. You do need to have eTap charger to charge the battery. Everything about Red eTap speaks to efficiency and performance and this SRAM Red eTap 11 Speed Rear Derailleur delivers.