Shimano Dura-Ace Di2 RD-R9250 12 Speed Rear Derailleur ZIPPMARCH Removable presta valve core

Removable presta valve core

Its smaller size allows for easier internal cable routing

All-new shifting features create a smoother

Super lightweight tube

The new Record™ 12x2 Speed crankset can be installed on any type of frame

Shimano Dura-Ace Di2 RD-R9250 12 Speed Rear Derailleur ZIPPMARCH Removable presta valve coreThe Shimano Dura Ace Di2 RD R9250 12 Speed Rear Derailleur represents the pinnacle of electronic road shifting. Developed for WorldTour racing and engineered for uncompromising performance, the RD R9250 delivers Shimanos fastest, most precise rear shifting ever. Featuring a semi wireless Di2 design, integrated wireless connectivity and intelligent system management, it provides lightning fast gear changes under full load while maintaining the