Molded polymer construction gives the Cervelo R-Series Bottom Bracket Cable Guide its combination of durability and low friction. The material resists wear from cable movement while keeping shifting effort minimal—two qualities that matter when cables pass through this junction thousands of times per ride. Cervelo designed this guide specifically for the oversized bottom bracket shell found on R-Series frames, where the larger junction area required a cable guide shaped to match rather than a generic aftermarket solution.

The guide directs shift cables from the downtube around the bottom bracket and up toward the front and rear derailleurs. Proper alignment through this transition keeps cable tension consistent and prevents housing from rubbing against the frame. When a cable guide wears out or cracks, cables can slip out of position, contact the bottom bracket shell directly, or bind during shifts. None of those outcomes help your drivetrain performance, and all of them risk cosmetic damage to the frame's finish.

Compatibility spans the R-Series lineup including the Rca, R5, and R3 models from 2014 forward. The guide also fits S-Series frames from 2014 through 2018 (excluding the 2014 S5, which uses a different design) and C-Series frames. Check your frame's model year before ordering to confirm the correct part number, as Cervelo has used different guide designs across generations. The BBG-R-2006 designation indicates this specific version for earlier R-Series production.... Read More