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Dura Ace R9170
This ergonomic design helps reduce fatigue while enabling efficient power transfer during sustained efforts
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Shimano Junction A SM-EW90-A-5 Port Assos_Bibshort Dura Ace R9170SHIMANO Junction A E TUBE Under Stem Mount 5 Port SHIMANO's SM EW90 B 5 port Junction A mounts neatly to the bike stem and connects with E TUBE wires from DI2 shifters, accessory shifters, and the downtube junction wire. The SM EW90 junction box features an integrated battery level indicator, charging port, and gear index setup switch.
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