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Shimano Di2 Battery Mount
Shimano

Shimano BMR1 and BRM2 Di2 External Battery Mount Base Unit A

Type: Electronic Shifter Parts
$75.00
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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/