NEW Shimano EW-JC304 Di2 Junction Box - 4 Ports, Use With EW-SD300 type_touring-bikes it sets a new standard

it sets a new standard as ideal first pedal bike for children ages 3-7

Tubes: included and installed

but it still works with a normal freehub body and chain

Competition race spokes and Squorx nipples

Tough silver powdercoat finish

NEW Shimano EW-JC304 Di2 Junction Box - 4 Ports, Use With EW-SD300 type_touring-bikes it sets a new standardShimano Di2 Frame Junction Box Frame 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