NEW Shimano EW-JC304 Di2 Junction Box - 4 Ports, Use With EW-SD300 type_touring-bikes Re-tuned Charger 2 damper for

Re-tuned Charger 2 damper for next level compression and rebound control

Tough silver powdercoat finish

but it still works with a normal freehub body and chain

Bleed valve for fine-tuning pressure

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

NEW Shimano EW-JC304 Di2 Junction Box - 4 Ports, Use With EW-SD300 type_touring-bikes Re-tuned Charger 2 damper forShimano 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