Product Details

The GRX Di2 RD-RX827 1 x 12-speed rear derailleur, with new Shimano Shadow ES technology, is offered in a single SGS long-cage spec and was built for durability and functionality. The derailleur features a low-profile wedge design, and the chain stabilizer unit blends seamlessly into the body to minimize exposure to impacts.

• SGS long cage for 10-51 cassette: Speed paired with range; the long cage rear derailleur withstands hard impacts on the trail and scores with lightning-fast shifting speed and top-class performance at the same time
• Low Profile Design: Shimano Shadow ES technology delivers a wedge-shaped design that reduces the derailleur’s front-facing surface area and eliminates edges that could catch on rocks and road debris
• Automatic Impact Recovery Function: The derailleur absorbs impacts and then automatically resets the rear derailleur, ensuring continued performance
• Super Strong Design: The rear derailleur body boasts a wide, well-braced linkage and solid pulleys to minimize debris entry and ensure durability
• New Chain Stabilizing Technology: The dual spring design creates higher chain tension for better chain wrap and retention
• Battery Protection: Tucked safely inside the rear derailleur body, the sealed battery won’t budge even in the roughest terrain but is still easily removed for charging

• SHIMANO SHADOW ES Technology
• Precise wireless shifting
• Robust structure with skid plate design
• Solid pulley construction
• Removable and rechargeable onboard battery (not included)
• 700km to 1,000km range depending on riding conditions
• Weight: 449g
• Compatibility:
  • Dual Control Lever: GRX ST-RX825, Dura Ace ST-R9270, Ultegra ST-R8170, 106 ST-R7170
  • Cassette: 1x12-speed (10-51 cassette)
  • Chain: 12-speed HG

Note: Di2 Battery and Di2 Charger sold separately.

About Shimano
Established in Japan in 1921, Shimano is the worlds largest bicycle component manufacturer. Whether it be drive systems, brakes, pedals or shoes, Shimano stands for reliable quality and performance. From Road & Gravel to Mountain, Touring & Urban use, Mechanical or Electric.