Check the listing for details. FSA K-Force WE 11-Speed Front Derailleur - Wireless Bluetooth, Braze-On,. Condition: New. Listed at 405.57 USD. New K-Force WE 2 X 11-Speed system All stainless steel hardware ANT, ANT+ and Bluetooth Shifter Compatibility - K-Force WE Cassette Compatibility - K-Force WESIZES Maximum Tooth Differential - 16T Fits standard braze-on mountsFINISH Black and silver graphicWEIGHT 162 grams Functional WE groupset requires: Right+Left Shifters, Front+Rear Derailleuers, and Battery+Charger+Cable set.16T max chainring differential is compatible with most chainring combinations. Rack and pinion mechanical movement for precise, predictable, quiet and near-instantaneous shifting. Uses ANT, ANT+ and Bluetooth with a private key and customized communication protocol to offer wireless communication from the shifter to provide safe, secure, fast, reliable, and efficient low consumption signal transmission to the.