Shimano GRX RX 815 Series Dealer's Manual page 33

INSTALLATION/REMOVAL
OVERALL WIRING DIAGRAM (external battery specifications)
` When using junction [A] on the inside
Use a built-in type junction [A]. This wiring example shows a configuration where most of the
wiring (except for around the battery and cockpit) is inside the frame. 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
Electric wire (EW-SD50-I)
(G)
From battery mount to junction [B]
(H)
From front derailleur to junction [B]
(I)
From rear derailleur to junction [B]
(J)
From wireless unit to junction [B]
Built-in bar end type
(H)
(I)
(E) (F)
(A)
(B)
Built-in frame type
(E)
(D) (G)
(C)
Lithium-ion battery (external type):
(B)
SM-BTR1
(D)
Junction [B]: SM-JC41
(F)
Branch type junction: EW-JC130
(G) + (H) ≤ 1,500 mm
(G) + (I) ≤ 1,700 mm
(J) ≤ 1,400 mm
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(C)
(J)
(F)