Sram red aero glide 10 speed rear mechif you want for the fastest quietest shifting around look no further the new sram red rear derailleur has been designed to deliver the performance advantage youve come to expect from sram the derailleur is designed with sram exact actuation technology for precise efficient shifting sram have paid rapt 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 ch