The sram red22 rear derailleur ensures that you are always at the height of your capability with fantastic performance levels that only sram could provide this rear derailleur has been designed to provide the most efficient and precise shifting motion to date with the addition of a hollow titanium anchor bolt and improved tooth geometry of the jockey wheel the rear derailleur is the most refined build to date the result of these improvement on the sram red22 rear derailleur is a chain ru