The Shimano Ultegra RX800 delivers Ultegra’s legendary and reliable performance in a more stable package. Featuring an integrated chain stabiliser mechanism, the RX800 derailleur is perfect for those that are looking for a quieter experience and shifting security on mixed terrain and surfaces. Utilising the Shadow design technology trickled down from Dura-Ace, it offers a sleek appearance and optimised and consistent shifting performance. The low-profile shadow design places it closer inbound to the frame and tucks the derailleur under the cassette. This helps to protect the derailleur in the event of a crash and minimises the general risk of being bumped and banged, allowing it to remain better aligned for smooth, quick and consistently accurate shifting performance. The GS version allows for a wide gearing range and accommodates up to a 34t rear cassette.