SpecificationsGroup 105 DI2 R7100 Disc, 170 mm, 50x34D, 11-36This package contains:ICNM7100126Q - SHIMANO CN-M7100 HG 12-speed chain E-BIKE RATED 126 QUICK-LINK linksIR7170DRRDSC170E - SHIMANO 105 Brake (Kit) BRR7170KTSTR7170 Right / rear Resin with fin Without adapter, for 25 mm rear mounting thickness 1700 (black)IBTDN3001 - SHIMANO Battery (Di2 spec.) BT-DN300 Internal 3.7 WhIFCR7100CX04 - SHIMANO 105 FC-R7100 12-speed crankset 170.0 mm 50-34T BlackICSHG71012136 - SHIMANO CS-HG710-12 12-speed cassette 11-12-13-14-15-17-19-21-24-28-32-36IRDR7150E - SHIMANO 105 Rear derailleur (Di2 spec.) RD-R7150 12 speed Compatible with direct mountIR7170DLF6SC100E - SHIMANO 105 Brake (Kit) BRR7170KTSTR7170 Left / front Resin with fin Assembled front bracket for 160 mm 1000 disc (black)IEWEC300A - SHIMANO EW-EC300 charging cableIFDR7150F - SHIMANO 105 Front derailleurs (Di2 spec.) FD-R7150 Double Down Swing Soldered Color series