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Shimano SM JC41 Di2 Internal Frame Junction Box 4 Port MFPN=11.6818.051.001 Zero Friction cam surface treatment ensures Weight 653 Zero Friction cam surface treatment ensures smooth lever action Handlebar Weight 330g Upsweep 5 Handlebar Width 800mm Rise 40mm Stem Clamp Diameter 31 Using Di2 components with different firmware versions may cause malfunctions Shimano Di2 Frame Junction BoxFrame Junction Box connects via SD50 E tube wires to four different points: front derailleur rear derailleur cockpit junction box and battery mount
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