Take your rides to the next level with the Shimano RD-RX805 ULTEGRA GS 11sp rear derailleur. Its integrated chain stabilizer and SHIMANO SHADOW RD+ technology ensure smooth and secure shifting on any terrain. On smooth surfaces, the ON/OFF switch allows for easy chain tension adjustment. Upgrade to the DI2 version for the ultimate in digital precision and synchronized shifting. Unleash your daring spirit with this powerhouse derailleur.