Shimano SM-JC41 Di2 Internal Junction B Box Echelon Improves climbing efficiency and reduces

Improves climbing efficiency and reduces weight (~10 grams)

this lightweight stem is ready for anything you can throw at it

Eagle 12spd compatible

Available in $50

The Thomson Elite seatpost is over 40% stronger on ultimate strength tests than the strongest production seatposts on the market

Shimano SM-JC41 Di2 Internal Junction B Box Echelon Improves climbing efficiency and reducesFor internal DI2 wire routing, SHIMANO's SM JC41 Junction B is the central connector for DI2 systems. Wires from the front and rear derailleurs, cockpit area, and battery all plug into the 4 port SM JC41 junction, which is housed inside the bike frame. Specifications For internal wire routing Mfr Claimed Weight 4. 1g