The Shimano Dura - Ace RD - R9250F Di2 rear derailleur is a top - notch cycling component. It comes with a 12 - speed medium cage and includes the TL - EW300 in black. This derailleur integrates a system charging port and a wireless connectivity unit. It offers ultra - fast and precise shifting, suitable for any competitive race. With a single cage length, it can shift cassettes from 11 - 28 to 11 - 34, providing great versatility. Key features include ultra - fast Di2 rear shifting, a compact design with an integrated wireless unit charger switch, wider range capacity, a max low sprocket of 34t, a CFRP rear derailleur plate, an LED status indicator, and functions like battery indicator, pairing, and adjust mode. Technical specs: largest cog 34, color black, compatible with Shimano Road Di2, Shimano Rear Direct Mount and 10x1 Standard, 12 drivetrain speeds, chain wrap capacity of 37 teeth, and a medium cage length.
Using this Shimano Dura - Ace RD - R9250F Di2 rear derailleur is easy. First, make sure it's properly installed on your bike according to the Shimano Road Di2 compatibility. When you start cycling, you'll enjoy the ultra - fast shifting with just a light touch of the shifter. The LED status indicator will show you the current status. For pairing and adjusting modes, follow the instructions in the manual. As for maintenance, keep it clean. After a long ride, wipe off dirt and grime. Check the chain wrap capacity regularly and make sure the largest cog (34t) is in good condition. Also, check the battery level on the indicator and charge it using the integrated charging port when needed. Avoid exposing it to extreme weather conditions for long periods as it may affect its performance.
