Easily Accessible, Discoverable, and Usable - Shifting operation can be performed with the thumb or fingers without changing position or grip - The most aerodynamic extension shifters - SRAM RED® eTap shifting logic for intuitive and reliable gear changes - Connects with SRAM eTap BlipBox™ using 650 mm connections - Mounts at the end of each extension with an inner diameter of 19-21.5 mm - Serves as an alternative to eTap Blips for attachment to extensions