A new level of performance for SHIMANO 12-speed road rear derailleurs
If 28 isn't helping you climb then this wide 36T-compatible 12-speed Di2 rear derailleur should. Receiving the wireless shifting signal from the shift lever, the SHIMANO 105 rear derailleur completes a shift in the blink of an eye with its high-performance motor and optimized link structure. This is the hub of the Di2 system, with the charging port, indicator LEDs, adjustment switches and more integrated into a compact package. A low-profile design reduces damage from contact and falls.
Compact design includes an integrated wireless unit, charger, switch
LED status indicator
Adjust mode, etc.
Wider range capacity
Max Low(big) Sprocket 36T
Cage Length : one-spec
Total Capacity 41T
Mount: Direct Attachment (conventional)/Direct Mount Compatible