Features - Shimano DURA ACE Di2 FD-R9250 2x12-speed Front Derailleur Braze On FULLY CUSTOMISABLE The drive can be adapted to the rider's preferences via the E-TUBE app Among other things, the shift speed can be set, a fully or semi-synchronous shift mode can be selected and the programme buttons on the gear lever can be assigned specific functions WHEN EVERY SECOND COUNTS Our exclusive wireless protocol increases shifting speed without sacrificing any of the shifting precision and reliability SHIMANO is known for Frontal area of attack of the front derailleur reduced by 33% Fastest gear changes front and rear Compact and clean optics Product features Use: Road Group: Dura Ace Di2 R9250 Model: FD-R9250 Mounting: Braze On Action: Down-Swing Gear front: 2-speed Gear rear: 12-speed Top gear teeth: 50-54T Total capacity: 16T Compatible chain: CN-M9100 HG 12-speed Chain stay angle: 61-66° Chain line: 43.5mm Compatible electric wire: EW-SD300 Firmware update by E-tube Project: Yes E-tube port (pcs): 1 E-tube connector (pcs): 0 Di2 Wireless-Chip: No