Shimano EW-JC304 Di2 Junction Box - 4 Ports Use With EW-SD300 MFPN=18013 or EC (traditional External Cup)

or EC (traditional External Cup) available for 1-1/8 inch and tapered steerers

and all 12

5 x 81mm 6061 CNC machined pedal body

Model Cushcore Air Valves Length 44mm Color Titanium Valve Presta Insert Compatible Yes Package Pair Size 44Mm

Shimano EW-JC304 Di2 Junction Box - 4 Ports Use With EW-SD300 MFPN=18013 or EC (traditional External Cup)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 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