Shimano GRX – United in Gravel Gravel is the great equalizer. No matter who you are, where you come from or where you want to go. Gravel celebrates individuality. It welds together in a shared passion. It lays the foundation for friendships and creates memories for the ages. Whether you ride one kilometer or a hundred. Whether with professional equipment or without. With a 10-speed, 11-speed or 12-speed gear system. Whether on paved roads, forest roads, back roads – or no roads at all. It does not matter why you are out there, all that matters is that you are. Shimano GRX RD-RX820 rear derailleur The mechanical Shadow RD+ rear derailleur stands for reliable and quiet shifting behavior in Gravel use. Matched to 2x12-speed drivetrains, the Shimano GRX RD-RX820 rear derailleur in combination with cassettes that feature a gradation of 11-34 teeth (CS-R8101-12, sold separately) or 11-36 teeth (CS-HG710-12, sold separately) offers a wide range of ratios with which a comfortable cadence can be ridden in any terrain. The highlight of the Top Normal rear derailleur is the integrated chain stabilizer, which not only guarantees safer chain management on changing surfaces, but also ensures quieter shifting processes. Whether in rough terrain or on slippery terrain, the adjustable chain tensioner can be activated or deactivated by a switch as required.