Pro Series Battery Holder 30.9-31.6mm Seat Post hydrationpacks All-steel construction on base and

All-steel construction on base and barrel

The shifter is compatible with 10 speed rear derailers

Surface active technology reduces static and dynamic friction and considerably lowers the force needed for easy breakaway

but what sets absoluteBLACK apart is that they don't rely on the same formula across all sizes

All-new design provides a best-in-class viewport for unparalleled vision

Pro Series Battery Holder 30.9-31.6mm Seat Post hydrationpacks All-steel construction on base andGrab this rubber compound PRO BATTERY HOLDER to position your Shimano Di2 battery inside the seatpost of your bike. This product is designed to perfectly suit the PRO PLT Seat Post and also other posts with a 30. 9 31. 6mm diameter.