Optimized to survive impacts, the M8250 12-speed medium cage rear derailleur is the ideal choice for everyday trail riding, offering unmatched durability, fast and precise shifting, and further weight reduction when paired with the 9-45D compact cassette. With the all-new Di2 shifting, automatic impact recovery, a 500% gear range, and 23 millimeters of additional ground clearance for impact-free riding, the M8250 rear derailleur is built to be always reliable, allowing you to focus solely on the trail ahead.

- RD Protection Function: The new Automatic Impact Recovery function instantly returns the derailleur to its original position after an impact
- SHIMANO SHADOW ES: The slimmest and toughest evolution of SHADOW RD+, SHIMANO's pioneering chain stabilization idea
- Precise and crisp wireless shifting: Ultra-fast shifting and a 500% gear range, without sacrificing anything
- Protected battery: Hidden safely inside an enclosed space, the battery doesn't move even on the roughest terrain, while remaining easily removable for charging
- Version: Wireless Di2, 1x12 speed, long cage
- Power: Shimano BT-DN320 Battery
- Compatible chain: 12-speed HG
- Maximum sprocket: 45 teeth
- Largest small sprocket max: 9 teeth
- Smallest small sprocket min: 9 teeth
- Pulley: Sealed bearing

Main Features:

- Use: MTB
- Derailleur Speeds: 12-speed
- Maximum supported sprocket (teeth): 45 teeth
- Derailleur cage length: Short
- Color: Black