somervillebikes
Hidden ground
The ground wire coming from the fork crown daruma bolt to supply the rest of the frame with ground is sandwiched between the bottom bracket shell and the cable guide.
This is necessary because the headset is non-conductive, so without a wire coming from the fork and terminating somewhere on the frame, the frame would not be able to conduct ground to the taillight.
It exits a hole hidden by the plastic guide, and runs inside a channel filed into the guide. It terminates as a ring terminal on the bolt fastening the guide. The guide was filed to hold the wire and ring terminal flush, so the guide still seats flush against the bottom bracket.
The wire on the left is the taillight hot wire, which exits the BB shell and heads back to the rear fender through a small brazed on guide on the underside of the chain stay.
Hidden ground
The ground wire coming from the fork crown daruma bolt to supply the rest of the frame with ground is sandwiched between the bottom bracket shell and the cable guide.
This is necessary because the headset is non-conductive, so without a wire coming from the fork and terminating somewhere on the frame, the frame would not be able to conduct ground to the taillight.
It exits a hole hidden by the plastic guide, and runs inside a channel filed into the guide. It terminates as a ring terminal on the bolt fastening the guide. The guide was filed to hold the wire and ring terminal flush, so the guide still seats flush against the bottom bracket.
The wire on the left is the taillight hot wire, which exits the BB shell and heads back to the rear fender through a small brazed on guide on the underside of the chain stay.