SRAM Red Aero Glide Rear Derailleur 2013
When SRAM first introduced its groundbreaking 10-speed Red component group, the heart of the industry-shaking design was 1:1 Exact Actuation technology. In ordinary terms, this means that with each shift the derailleur pulls the same exact length of cable, regardless of what gear you're in. 1:1 is simple to set up, it stays in adjustment longer, and it provides laser-accurate shifting. The Red Aero Glide Rear Derailleur benefits more directly from the lessons learned over the life of first generation 1:1 than if SRAM were to start from scratch.