The Shimano FD-6870 [paid link] front derailleur is part of the Ultegra Di2 series, designed to deliver precise electronic shifting and long-term reliability. However, like all high-performance components, it requires proper cleaning and lubrication to maintain smooth operation. Neglecting these steps can lead to sluggish shifting, premature wear, and increased noise. This guide outlines the best cleaning and lubrication practices to keep your FD-6870 [paid link] in peak condition.
Understanding the FD-6870 Front Derailleur
The FD-6870 [paid link] is an electronic front derailleur that operates with Shimano’s Di2 system. Unlike mechanical derailleurs, it does not rely on cable tension but instead uses an electronic motor to move the cage. While this reduces the risk of cable-related wear, the derailleur still requires attention to pivots, linkage points, and the cage to prevent contamination from dirt, road grime, and chain lubricant overspray.
Tools Required
- Clean microfiber cloths
- Mild degreaser (bike-specific, non-corrosive)
- Small brush (soft-bristled)
- Light synthetic lubricant (suitable for pivot points)
- Chain-specific lube (avoid excess application)
Step 1: Initial Cleaning of the FD-6870
Regular cleaning prevents the buildup of grime that can interfere with smooth shifting. Start by wiping the derailleur cage with a microfiber cloth to remove surface dirt. If the chain has recently been lubricated, check for overspray that may have settled on the inside plates of the derailleur.
For more stubborn dirt, use a mild degreaser applied to a soft brush. Carefully scrub the cage, linkage points, and surrounding areas. Avoid spraying degreaser directly into the motorized sections of the derailleur, as this can damage the electronics. After brushing, wipe all areas thoroughly with a clean cloth.
Step 2: Focusing on the Pivots and Linkage
The FD-6870 includes several pivot joints where dirt and moisture can accumulate. These areas are prone to corrosion and wear if left untreated. Once the derailleur is clean and dry, apply a very small drop of light synthetic lubricant to each pivot.
It’s important to use minimal amounts—excess oil attracts dirt, which can undo the cleaning process. After applying, move the derailleur cage by hand to allow the lubricant to penetrate. Wipe away any visible excess.
Step 3: Cleaning the Derailleur Cage
Since the cage directly interacts with the chain, it often picks up grease and debris. Over time, this buildup can cause noisy or sluggish shifting. Clean both inner and outer cage plates thoroughly, ensuring all dirt is removed from the surfaces where the chain runs.
If residue remains, use a degreaser on a cloth to polish the plates. Keeping the cage clean not only improves performance but also reduces unnecessary friction that can wear the chain.
Step 4: Lubrication Best Practices
The FD-6870 does not require heavy lubrication. Its electronic design minimizes mechanical friction compared to cable-actuated derailleurs. Focus lubrication efforts only on pivots and linkage joints, never on the motorized housing or electronics.
For the chain, apply a quality chain-specific lubricant and wipe away all excess before riding. Over-lubrication leads to splatter, which contaminates the derailleur cage. A well-maintained chain reduces the stress placed on the derailleur and ensures crisp gear changes.
Step 5: Establishing a Maintenance Routine
Consistency is key to maintaining the FD-6870. Riders should inspect the derailleur after wet rides or during periods of heavy road grime exposure. For normal road use, a detailed cleaning and lubrication every 200–300 kilometers is sufficient.
During seasonal overhauls, remove the chain and give the derailleur a more thorough cleaning. Always check the cage alignment afterward, as buildup or residue can occasionally give the appearance of poor shifting when the derailleur itself is mechanically sound.
Common Mistakes to Avoid
Many riders unintentionally reduce the lifespan of their FD-6870 by using incorrect cleaning or lubrication methods. Avoid spraying degreasers or cleaners directly onto the electronic housing, as moisture can compromise the motor system. Additionally, refrain from using thick, sticky lubricants that are designed for cables or suspension pivots—these will only trap grime.
Another frequent mistake is neglecting to wipe excess lubricant. Even a small amount left on the cage or pivots can attract dust, leading to sluggish performance.
Final Thoughts
Maintaining the Shimano FD-6870 front derailleur requires attention to detail, but the routine is straightforward once established. Regular cleaning of the cage, careful lubrication of pivot points, and consistent chain maintenance ensure precise and quiet shifting. By avoiding common mistakes and sticking to a disciplined schedule, riders can extend the lifespan of their FD-6870 and enjoy the reliable performance that Shimano’s Ultegra Di2 system is known for.