The Shimano FD-6700 [paid link] Ultegra front derailleur is designed to deliver smooth, accurate shifting when installed and maintained correctly. However, over time, the shift cable can stretch, fray, or corrode, leading to sluggish or inconsistent front shifting. Replacing the cable on your FD-6700 [paid link] is a straightforward but precise task that ensures reliable performance. This guide covers everything you need to know about removing the old cable, installing a new one, and fine-tuning your set-up for optimal function.
Tools Required
- 5 mm hex wrench
- Cable cutters
- Small flat-head screwdriver
- New shift cable and housing (Shimano-compatible)
- Cable end cap
- Light grease or cable lubricant
Preparing the FD-6700 for Cable Replacement
Before removing the existing cable, shift the front derailleur into the small chainring position. This releases tension on the cable and makes removal easier. Inspect the derailleur body for dirt or corrosion, and clean the area around the pinch bolt. A clean working surface reduces friction and prevents contaminants from entering the new cable path.
Removing the Old Cable
To release the old cable, start by loosening the cable anchor bolt with a 5 mm hex wrench. Once loosened, pull the cable free from the derailleur’s pinch point. Next, remove the cable from the shifter by accessing the cable port—this is done by shifting the lever fully and guiding the old cable out through the shifter mechanism. Discard the worn cable and check the housing for any cracks, kinks, or corrosion. If damaged, replace the housing at the same time for maximum performance.
Installing the New Cable
Insert the new shift cable into the shifter, feeding it through the internal routing until it emerges cleanly on the opposite side. Apply a thin layer of light grease or cable-specific lubricant to the new cable before threading it through the housing. This step reduces friction and improves shifting longevity.
Feed the cable through the derailleur’s cable guide and position it under the anchor bolt. Pull the cable taut but do not overtighten. Secure it firmly by tightening the anchor bolt with a 5 mm hex wrench. Trim excess cable with cable cutters, leaving about 3–4 cm beyond the anchor point, and crimp a cable end cap to prevent fraying.
Adjusting Tension and Alignment
Once the new cable is installed, check derailleur alignment and adjust cable tension. Begin by fine-tuning with the barrel adjuster at the shifter. The FD-6700 [paid link] relies heavily on precise cable tension for accurate shifting between chainrings. Test the shifting by cycling through both chainrings, making sure the chain moves smoothly without hesitation or rubbing.
If shifting feels sluggish, increase tension slightly by turning the barrel adjuster counterclockwise. If the chain overshifts or rubs on the cage, reduce tension with a clockwise adjustment. Recheck both high and low limit screws to ensure the derailleur stops the chain correctly without overshooting.
Troubleshooting Cable Replacement Issues
If shifting remains inconsistent after cable replacement, recheck cable routing. The FD-6700 requires proper alignment with the frame’s cable guide for smooth function. A common mistake is failing to seat the cable head correctly inside the shifter, leading to slack or binding. Additionally, frayed cable ends inside the housing can increase resistance, so always install fresh cable housing when replacing a heavily worn cable.
Optimizing Performance After Replacement
Replacing the shift cable is not only about restoring basic function but also about maintaining peak performance. For the FD-6700, the best results come from using Shimano stainless steel cables with lined housing for reduced friction. Regular lubrication at the cable entry and exit points will extend the lifespan of both the cable and derailleur. Riders who frequently ride in wet or gritty conditions should schedule cable checks every few months to prevent premature wear.
Conclusion
Replacing the cable on your Shimano FD-6700 front derailleur is a critical step in maintaining precise shifting performance. By carefully removing the old cable, installing a fresh one with proper lubrication, and fine-tuning tension, you can restore your drivetrain’s efficiency and extend the life of your derailleur. Regular inspection and timely replacement ensure that your FD-6700 continues to deliver the crisp, reliable front shifting it was designed for.