Shimano EW-JC304 Di2 SD300 4-Port Junction Box Insulating • Holds 59 mL (2

• Holds 59 mL (2 fl

Built tough for all-season use

a third-generation hiker of the Cascade mountains

- Optimized chain for HG sprocket which provides a fast and precise rear shifting performance (especially during downshifts)

It has the front wider than the standard one

Shimano EW-JC304 Di2 SD300 4-Port Junction Box Insulating • Holds 59 mL (2The 2nd generation Di2 e Tube wiring system from Shimano has the SD300 designation. These wires and connectors are thinner than the SD50 generation. if you need to join two wires to one (3 total wires), or two pairs of SD300 wires to create a longer length for both pairs (4 total wires), you will need this EW JC304 Di2 SD300 4 Port Junction Box. This is actually a simple looking dual tube connector with internal ports on both ends of each side that