Sram red etap 11sp road front derailleurthe sram red etap front derailleur makes use of sram yaw technology, a technology that changed front shifting forever, eliminating the need for trimming'. '.strtoupper('u')sing sram's proprietary wireless communication protocol, utilising 128 bit encryption, the shifts are quick, clean and crisp'. '.strtoupper('t')he system optimises yawtrade adjustments as required throughout the shift range, there's no rider input needed, you just click and the derailleur smoothly and cleanly engages the front ring you want.the derailleur uses etap batteries that are quite literally a snap to remove and charge'. '.strtoupper('s')imply flip the tool free battery latch up and slide the battery up and out of the derailleur'. '.strtoupper('t')hen snap the battery into the usb powered charger and connect the charger to any usb power source or a c usb adaptor'. '.strtoupper('a') full charge takes just 45 minutes to complete.featureswireless connection via aireatrade network for fast and clean installationbraze on clamp adaptordesigned to work with sram x glidertrade 11 speed chainrings187g with batteryfor use with double chainsetbuy sram components from chain reaction cycles, the world's largest online bike store.