The Shimano XTR Di2 RD-M9250 is not just a rear derailleur; it's the intelligent hub of Shimano's most advanced mountain bike electronic shifting system. Engineered for professional-level cross-country, trail, and enduro racing, this 12-speed derailleur delivers blazingly fast, precise, and highly robust shifting performance, now with unprecedented wireless integration and impact resilience.

• Integrated Battery Housing: This is a groundbreaking feature unique to the M9250 (and XT M8250) rear derailleur. The **Shimano BT-DN320 battery** (the primary power source for the entire shifting system) fits directly and securely **inside a dedicated, protected compartment within the derailleur body itself**. This eliminates the need for any wires running to a separate battery in the frame or seatpost, making for an incredibly clean and truly wireless system from the shifters to the derailleurs.
• Wireless Communication: The M9250 rear derailleur communicates wirelessly with the XTR Di2 shifters, providing instant and precise gear changes without any cables.
• HYPERGLIDE+ Shifting: Leverages Shimano's renowned HYPERGLIDE+ technology for super-fast and smooth shifting both up and down the cassette, even under high pedaling loads. The chain seamlessly glides across the cassette cogs for uninterrupted power delivery.
• SHIMANO SHADOW ES (Evolution Stabilizer) Technology: An advanced, slimmer, and stronger evolution of Shimano's chain stabilization. This system maintains high chain tension and retention without the need for a traditional clutch on/off switch, providing superior chain security over rough terrain and eliminating chain slap.
• Automatic Impact Recovery Function: A revolutionary feature that allows the derailleur to sense and pivot away from impacts. If struck, the motor intelligently returns the derailleur to its original position instantly, ensuring continuous, uninterrupted shifting performance and preventing catastrophic damage.
• Robust & Protected Design:
  • Wedge Shape: The derailleur body features a unique wedge shape designed to glance off trail obstacles more easily, preventing direct blunt force impacts.
  • Durable Materials: Constructed with a wide link structure, durable carbon inner and outer cage plates, and solid pulley wheels, enhancing overall robustness and longevity.
  • Skid Plate Design: Incorporates a robust skid plate to further protect the internal components, including the integrated battery, from rock strikes and trail debris.
• Optimal Gear Range Options: Available in:
  • GS (Mid Cage) version: Optimized for use with 10-45T 12-speed cassettes, offering precise gear steps for XC racing and riders seeking maximum ground clearance.
  • SGS (Long Cage) version: Designed for the wider 10-51T 12-speed cassettes, providing a massive gear range suitable for all-mountain and enduro applications.
• Conventional Mount: Utilizes a standard direct attachment (conventional) mount, ensuring broad compatibility with most mountain bike frames.
• E-TUBE Project Connectivity: Fully compatible with Shimano's E-TUBE Project app, allowing for wireless firmware updates, customization of shift modes, multi-shift settings, and battery status monitoring via Bluetooth(R) LE.