Cervélo S3 DISC Manual De Instrucciones página 33

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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