Cervélo R5 Disc Manual page 11

Route gear cables out of the bottom
bracket cable port. Ensure that the
cables are not twisted together.
Install Rear Derailleur Press-In Cable Stop.
The front cable travels across the non-drive side slot, and in
the direction of the seat tube. The rear cable travels along the
drive side slot, and along the chain stay. When complete, snap
Bottom Bracket Cable Guide into place.
As per manufacturer's instructions, install rear derailleur on rear
derailleur hanger, cut appropriate housing length, and attach cable.
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