The SRAM eTap battery is the power source for the eTap system. The same power unit is interchangeable between front and rear derailleurs.
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Shimano Di2 R8050 Road Shifter Set
The Shimano Ultegra R8050 Di2 2x11-Speed Shifter Set offers an increase in accuracy and shifting precision, delivering a more intuitive operation. The updated ergonomic design of this Shimano Ultegra R8050 Di2 2x11-Speed Shifter Set clearly separates the shift buttons so you can shift easily and efficiently, even in the depths of winter when you're wearing thick gloves.