Tool-free installation makes this Downtube Cable Guide from Cervelo easy to swap when converting between drivetrain types or replacing a damaged original. The hard plastic clip snaps directly into the downtube port on compatible frames, guiding shift cables or electronic wires into the frame's internal routing without requiring bolts or adhesive. Two versions cover the range: CBS-2DT112EL handles Di2 wire routing, while CBS-2DT112ME provides cable stops for mechanical front and rear derailleur housing.

Frame compatibility spans the C3, C5, and R3 Disc models where these guides serve as the transition point between external housing and internal cable runs. The mechanical version includes integrated stops where shift housing terminates, with bare cable continuing through the downtube to the bottom bracket area. The electronic version provides a clean pass-through for Di2 wires with proper strain relief at the entry point.

If you're building up a frameset and need the correct routing hardware, or if your original guide cracked during a cable change, this is the OE replacement part. The guide also matters when switching from mechanical to electronic shifting since the two versions handle their respective cables differently. Mixing them up means housing that won't seat properly or wires without adequate support at the frame entry.... Read More