Shimano GRX RD-RX820 Rear Derailleur | 12-speed

The SHIMANO GRX rear derailleur revolutionizes gravel riding with enhanced chain security and smoother, more stable shifting. Designed specifically for the demands of gravel and mixed-terrain cycling, this 12-speed rear derailleur is compatible with 11-34T and 11-36T cassettes, ensuring you always find the perfect gear. An integrated chain stabilizer minimizes noise and keeps the chain firmly in place, even on the roughest trails. With the convenience of an ON/OFF chain tensioner switch, adapting to varying terrains has never been easier. Experience silent, secure, and reliable shifting with every ride.

Features:

• Compatible with 11-34T and 11-36T 12-speed cassettes for a wide gear range.
• Integrated chain stabilizer for quieter shifting and enhanced chain security.
• ON/OFF stabilizer switch for easy adaptation to different terrains.
• SHIMANO SHADOW RD+ technology ensures a lower profile and reduced chain bounce.
• Maximum front chainring difference of 17T, accommodating various gearing setups.
• Supports a top sprocket of 11T and a low sprocket up to 36T for optimal gearing range.
• Total capacity of 42T, suitable for broad gear combinations and shifts.

Technologies:

• SHIMANO SHADOW RD+: Reduces chain bounce and keeps the derailleur closer to the cassette for better ground clearance.
• Integrated Chain Stabilizer: Ensures smooth and silent shifting by controlling chain tension.
• Adjustable Tension ON/OFF Switch: Allows for quick adjustments to the chain stabilizer for optimal performance on any terrain.