Pushing the chain with the front derailleur requires the most power. The system’s battery pack is attached to the downtube (in front of the front derailleur).  |  Photo: Ben Delaney
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Dura-Ace electric - the battery pack
Pushing the chain with the front derailleur requires the most power. The system’s battery pack is attached to the downtube (in front of the front derailleur).  |  Photo: Ben Delaney
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