Shimano Dura-Ace Di2 RD-R9250 2x12 Speed Rear DerailleurThe 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. BENEFIT Our fastest ever rear shifting, 58% faster than RD R9150 BENEFIT Compact design includes an integrated wireless unit, charger, and switch BENEFIT LED

Compatible chain: HG 9-speed

ETRTO： 57-559

Compact design and lightweight

• Version for GRX single x 12-speed drivetrains

•    170mm

Shimano Deore M6100 Hydraulic Disc Brake Set Front&Rear MTB

Pin Length:  5

Top sprocket                            Max

Color Series color

Even during maximal efforts up a climb or nearing the finish line

you can wash the bottle with detergents

Mount_Direct attachment (Conventional): Yes