The SRAM Red Series was created to blur the boundaries between man and machine. Powerful and pure, light and quick, SRAM Red epitomises true advancement, leveraging design and innovation with zero restraint on performance. Carbon Cages, Carbon Inner Links, Titanium HardwareMore Clearance with 28t Cassettes Thanks to a Longer B-knuckleSilent Shifting with Optimized AeroGlide Pulleys and Ceramic BearingsChain Pulley Cage Adds Precise Chain ManagementTitanium pinch bolt keeps a low profile while minimizing weight The SRAM Red Short Cage Rear Derailleur was designed using SRAM s Exact Actuation Technology for precise shifting, and features carbon cages, carbon inner links and titanium hardware. Thanks to a larger B-Knuckle the derailleur offers greater clearance with 28T cassettes, the barrel adjuster is spring fixed, the chain pulley cage ensures precise chain management and the titanium pinch bolt keeps a low profile whilst minimising weight.