Our fastest ever shifting across SHIMANO&';s widest ever DURA-ACE gear range, the RD-R9250 is capable of both race wins and personal bests. The DURA-ACE RD-R9250 integrates the system charging port and a wireless connectivity unit all while delivering super fast, precise shifting worth of any podium. A single cage length that is compatible with 28-34T low sprockets brings new versatility to the world&';s best road component group. FEATURES - Our fastest ever rear shifting, 58% faster than RD-R9150 - Compact design includes an integrated wireless unit, charger, and switch - LED status indicator Battery indicator Pairing Adjust mode, etc. - Wider range capacity Max. low sprocket: 34T - CFRP rear derailleur plate PRODUCT SPECIFICATIONS - MODEL NO RD-R9250 - SERIES DURA-ACE R9200 Series - Color Series color - Average weight 215 - Remarks w/o Bracket spec. available - Firmware update by E-TUBE PROJECT - Total capacity 37T - Charging port (pcs) 1 - B-axle_Hollow axle - B-axle 2_Hollow axle - Mount_Direct attachment (Conventional) - Mount_Direct Mount - Fluoric coated link bushings 4 - Low sprocket_Max. 34T - Low sprocket_Min. 30T - Max. front difference 16T - Pulley_G pulley bearing - Pulley_Sunken type pulley bolt - Pulley_Teeth 11 - Pulley_T pulley bearing - Top-normal spring type_SHIMANO SHADOW RD - Top sprocket_Max. 11T - Top sprocket_Min. 11T - Rear speeds 12 - Charging cable EW-EC300 - Di2 connectivity wired_Di2 shifting - Di2 connectivity wireless_ANT private (*2)_Adjust mode information - Di2 connectivity wireless_ANT private (*2)_Di2 battery level - Di2 connectivity wireless_ANT private (*2)_Gear position - Di2 connectivity wireless_ANT private (*2)_SHIMANO STEPS data items (*3) - Di2 connectivity wireless_BluetoothA(R) LE custom (*1)_Adjust mode information - Di2 connectivity wireless_BluetoothA(R) LE custom (*1)_Compatible with E-TUBE PROJECT - Di2 connectivity wireless_BluetoothA(R) LE custom (*1)_Compatible with E-TUBE RIDE - Di2 connectivity wireless_BluetoothA(R) LE custom (*1)_Di2 battery level - Di2 connectivity wireless_BluetoothA(R) LE custom (*1)_Gear position - Di2 connectivity wireless_BluetoothA(R) LE custom (*1)_SHIMANO STEPS data items (*3) - Di2 connectivity wireless_Di2 shifting - LED for system status - SD300 connector (pcs) 0 - SD300 port (pcs) 1 - SD50 connector (pcs) 0 - SD50 port (pcs) 0