Pro Series Battery Holder 30.9-31.6mm Seat Post hydrationpacks Surface active technology reduces static

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

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

The shifter is compatible with 10 speed rear derailers

and low component weight but don't want to shell out extra for the fancy bling of XX1

Pro Series Battery Holder 30.9-31.6mm Seat Post hydrationpacks Surface active technology reduces staticGrab 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.