Shimano SM-JC40 Di2 External Frame Junction Box 4-Port Product Type_Mountain Bikes We really can't say it

We really can't say it enough

5mm (W) x 150mm (L) x 90

A favorite among our family members

Water resistant and insulated

Color Black Ring Position/Type Chain Retaining Single Ring Tooth Count 32 Drivetrain Speeds 9 Drivetrain Speeds 10 Drivetrain Speeds 11 Drivetrain Speeds 12 Chainring BCD 104 Material Aluminum Defined Color Black

Shimano SM-JC40 Di2 External Frame Junction Box 4-Port Product Type_Mountain Bikes We really can't say itShimano SM JC40 Di2 External Frame Junction Box 4 Port. 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