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Shimano Di2 Cockpit Junction Box
Shimano

Shimano EW90-A Di2 Cockpit Junction Box 3-Port/ not for Flight Deck

Type: Junction Box
$140.00
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Shimano Di2 Junction Box
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/