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Shimano Di2 Battery Mount
Shimano

Shimano Di2 BTR2 Internal Battery Seat Tube Shim

Type: Electronic Shifter Parts
$12.00
Low Stock
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Shimano Di2 External Battery Mounts
All Di2 components on the bicycle require the same firmware version. Using Di2 components with different firmware versions may cause malfunctions
Use Di2 system checker to update component firmware from http://e-tubeproject.shimano.com/