The CeramicSpeed Oversized Pulley Wheel System provides optimization ...
and increased efficiency of the rear derailleur through its extremely low-friction bearings and unique overall design. Specifically designed for the SRAM Transmission to enhance the performance and longevity with FURTHER DRIVE Technology. ...
This is the Shimano Ultegra Di2 Internal Junction ...
Box. This box is referred to as the junction box "B" on a Di2 build. The SM-JC41 is for use with internal wiring setups and is the main center of e-tube Di2 ...