The Shimano FD-5700 [paid link] front derailleur, part of the 105 10-speed series, is designed to deliver precise, reliable shifting when installed and adjusted correctly. However, even small mistakes during installation can compromise performance, leading to chain rub, missed shifts, or even component damage. Understanding the most common errors riders and mechanics make when fitting this derailleur is essential to ensuring smooth operation and a longer lifespan.
Tools Required:
- 5 mm Allen key
- Phillips screwdriver
- Torque wrench [paid link] with Nm scale
- Cable cutters
- Chain tool
Incorrect Mounting Height
One of the most frequent mistakes with the FD-5700 [paid link] is positioning the derailleur cage too high or too low above the big chainring. Shimano specifies a clearance of 1–3 mm between the outer cage plate and the tallest tooth on the large chainring. If the cage sits too high, shifting will feel sluggish, and the chain may struggle to climb to the big ring. If it is too low, the cage risks contacting the chainring teeth, creating noise and wear. This adjustment requires careful measurement before tightening the clamp bolt.
Improper Cage Alignment
The derailleur cage must be parallel to the chainrings when viewed from above. If the cage is skewed, the chain will rub in certain gears, particularly on cross-chain combinations. Many riders mistakenly tighten the clamp bolt without first ensuring correct alignment. This misstep creates shifting inconsistencies and can increase friction on the drivetrain. A straight cage alignment ensures smooth transitions between rings and reduces the need for frequent trimming at the shifter.
Over-Tightening or Under-Tightening the Clamp Bolt
Torque accuracy is often overlooked during installation. The FD-5700 [paid link]’s clamp bolt should be tightened to 5–7 Nm. Over-tightening risks deforming the band or damaging the frame’s derailleur mount, while under-tightening can allow the derailleur to slip under cable tension. Using a torque wrench [paid link] is the only reliable way to prevent these issues. Correct bolt tension provides a stable base for precise shifting adjustments.
Cable Routing Errors
The FD-5700 supports bottom-pull cable routing, which must be set correctly for proper actuation. Common mistakes include routing the cable at the wrong angle, fraying the cable end during installation, or failing to seat the cable securely under the pinch bolt. Incorrect routing can cause excessive friction or reduce leverage, leading to poor shifting into the big ring. The cable should pass smoothly through the frame’s guides and clamp cleanly under the derailleur’s pinch plate.
Skipping Limit Screw Adjustment
Limit screws define the derailleur’s inward and outward travel. Many riders skip fine-tuning these after installation, assuming the factory setting will suffice. On the FD-5700, incorrect limit screw adjustment can cause severe issues. An inward limit set too tight prevents the chain from dropping onto the small ring, while one set too loose allows the chain to fall off the inside. Similarly, an outward limit screw set incorrectly risks dropping the chain past the large ring. Precise adjustment eliminates chain drop and protects the drivetrain.
Ignoring Cable Tension
Cable tension determines how quickly and smoothly the derailleur shifts across rings. Too little tension leaves the derailleur slow to climb onto the big ring, while too much tension prevents it from dropping cleanly to the small ring. The FD-5700 is sensitive to tension changes, especially after the first few rides when new cables settle. Riders often forget to re-check tension after initial installation, leading to degraded performance. A barrel adjuster on the downtube or shifter should be used to fine-tune tension until shifting is crisp in both directions.
Neglecting Chain Length Check
An improperly sized chain can make even a well-installed derailleur perform poorly. A chain that is too short increases drivetrain stress, while one that is too long creates slack and poor shifting response. The FD-5700 relies on correct chain sizing to maintain optimal shifting angles. Riders should size the chain using the big chainring-to-big sprocket method plus two additional links. Failing to do so compromises the derailleur’s ability to operate within its intended range.
Failure to Lubricate Key Points
Friction at the pivot points of the FD-5700 derailleur can increase over time, especially if installation is completed without applying a small amount of light grease. Many mechanics overlook lubrication during setup, which accelerates wear and reduces responsiveness. A small application of grease to the pivot points ensures smooth operation and prolongs component life.
Misjudging Frame Compatibility
The FD-5700 front derailleur is designed for specific chainline and seat tube angles. Installing it on a frame outside these specifications can lead to persistent issues, such as cage misalignment or restricted movement. Riders often force compatibility, only to experience chronic shifting problems. Checking frame specifications against Shimano’s technical documentation before installation prevents wasted time and poor results.
Conclusion
Installing the Shimano FD-5700 front derailleur demands careful attention to detail. Errors such as incorrect cage height, poor alignment, or skipping limit screw adjustments can ruin shifting quality and shorten component life. By following precise installation steps and avoiding the mistakes outlined above, riders can achieve the crisp, reliable shifting performance the 105 series is known for. A properly installed FD-5700 not only improves ride quality but also reduces the need for constant adjustments and repairs.