Shimano RD-RX805 Ultegra Di2 DeraileurThe Shimano RD-RX805 Ultegra Di2 Deraileur features an updated design that pushes road bike capabilities to encompass a broader range of riding styles. The Shimano Ultegra RX RD-RX800 Derailleur expands the potential of the Ultegra R8000 by combining chain stabilizing features with the same performance characteristics found in Shimano's road drivetrain. The Shimano RD-RX805 Ultegra Di2 Deraileur uses Shimano's SHADOW RD low profile design, which reduces crash vulnerability while providing a sleek integrated appearance.FeaturesChain Stabilizer mechanism adopted from mountain bike designON/OFF switch: for rides on smooth surfacesCompatability:current road DUAL CONTROL LEVERShimano Shadow RD Plus technology: reduces chain slapMax. front difference: Less distraction quiet drive train16T | Shimano RD-RX805 Ultegra Di2 Deraileur DI2, 11 SPEED