SRAM RED 22 Rear Derailleur has been designed to deliver the performance advantage you have come to expect from SRAM. The derailleur is designed with our Exact Actuation technology for precise, efficient shifting. We have paid special attention to the finer details, like adding a hollow titanium anchor bolt and even refining tooth geometry of the jockey wheel. The result is that the chain runs through the rear Derailleur smoother and quieter than ever before.