Shimano GRX RX 815 Series Dealer's Manual page 30

INSTALLATION/REMOVAL
OVERALL WIRING DIAGRAM (external battery specifications)
Electric wire (EW-SD50)
(E)
From battery mount to junction [B]
(F)
From front derailleur to junction [B]
(G)
From rear derailleur to junction [B]
(H)
From dual control lever to junction [A]
(I)
From dual control lever to junction [A]
(J)
From junction [A] to junction [B]
` When using junction [A] on the inside
Use a built-in type junction [A]. In this wiring example, some of the wiring will be inside the
handlebar.
The wireless unit can be used to send the current gear position and other information to an
external device.
Wiring component parts
(A)
Battery mount: SM-BMR2/BM-DN100
Junction [A]: EW-RS910 (Built-in bar end
(C)
type/built-in frame type)
(E)
Wireless unit: EW-WU111
Built-in bar end type
(G)
(H)
(I)
(E) + (F) ≤ 900 mm
(E) + (G) ≤ 1,100 mm
(H), (I) ≤ 500 mm
(J) ≤ 1,400 mm
(E) (F)
(A)
(B)
Built-in frame type
(E) (F)
(D)
(C)
Lithium-ion battery (external type):
(B)
SM-BTR1
(D)
Junction [B]: SM-JC40
(F)
Branch type junction: EW-JC130
30
(C)
(J)