Shimano

XTR Di2 RD-M9250 Short Cage Rear Derailleur

What Our Gearhead® Experts Are Saying:

"This is the derailleur I point racers toward when they want no compromises. It shifts instantly, shrugs off hits better than anything Shimano’s made before, and pairs perfectly with a 9–45T cassette for clearance and efficiency."

At the highest level of mountain biking, drivetrain performance must balance precision, durability, and weight. The XTR Di2 Rear Derailleur Medium Cage 12-speed is designed for riders who demand top-tier electronic shifting while riding terrain that regularly threatens drivetrain components.

Wireless Di2 technology ensures fast, accurate shifts under load, supported by HYPERGLIDE+ drivetrain compatibility for smooth gear engagement. Automatic Impact Recovery actively protects the derailleur by returning it to its indexed position after contact, while the SHIMANO SHADOW ES layout minimizes exposure by keeping the profile tight to the frame. A redesigned wedge shape further reduces direct impact force by deflecting rocks and trail debris.

Optimized for use with a compact 9–45T cassette, the medium cage configuration improves ground clearance while maintaining a full usable gear range for racing and aggressive trail riding. Lightweight materials, including a carbon plate paired with robust internal structure, make this derailleur equally suited for weight-conscious XC builds and demanding enduro setups.