SHIMANO - Junction B - E-TUBE - External Wire Routing - 4-Port

For external DI2 wire routing, SHIMANO's SM-JC40 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-JC40 junction, which is mounted under the bottom bracket.

Shimano warrants to the original retail purchaser that the Shimano bicycle division product for which they received this warranty, is free from non-conformities in material and workmanship for a period of two years and their Dura-Ace and XTR components are covered for a period of three years from the date of original retail purchase. Shimano footwear, soft goods and wheels are warranted for a period of one year.

  • For external wire routing
  • DURA-ACE R9150 Series
  • Average weight: 8.6
  • 4pcs E-tube port
  • 4 connectors type of junction Specification
  • External type
  • 4pcs SD50 port


Barcode # 4524667827443
Brand Shimano
Shipping Weight 0.3000kg
Shipping Cubic 0.001000000m3
Unit Of Measure each

Must be installed and serviced by qualified bicycle mechanic

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