Shimano EW-JC304 Di2 Junction Box - 4 Ports Use With EW-SD300 CheckoutTitle=Shimano GRX RX810 Chainring - 31t 5mm Lock Type Key

5mm Lock Type Key

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Reinforced toe and heel to be worn with cycling shoes

Shimano EW-JC304 Di2 Junction Box - 4 Ports Use With EW-SD300 CheckoutTitle=Shimano GRX RX810 Chainring - 31t 5mm Lock Type KeyShimano EW JC304 Di2 Junction Box 4 Ports Use With EW SD300. 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