12-Speed Compatibility: Smooth shifting across 12 speeds Noise Reduction: Equipped with Shadow RD+ Technology Chain Stabilization: Features an adjustable chain stabilizer Silent Operation: Near-silent functioning for a pleasant ride Cassette Compatibility: Works with 10-51T 12-speed MTB/cassette Weight: Lightweight at 288 grams Total Capacity: Supports up to 41T Pulley Teeth: 13T for efficient gear changes Low Sprocket: Compatible with 51T low sprocket Total Sprocket: 10T total sprocket Link Bushings: 6 fluoric coated link bushings for durability The Shimano GRX 820 SGS Rear Derailleur is a crucial component for smooth shifting on your gravel bike, handling a 12-speed system effortlessly with near-silent operation and seamless gear changes. It features Shadow RD+ Technology for silent functioning and a switchable chain stabilizer that reduces chain slap and drop, being lighter and more efficient than roller types. Compatible with 10-51T 12-speed MTB or gravel cassettes, it offers ample gearing options, making it an ideal choice for gravel riders.