How to Install, Adjust, and Maintain the FH-6800 Hub

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The Shimano FH-6800 [paid link] hub, part of the Ultegra 6800 series, is a high-performance rear hub designed for road cyclists who demand smooth engagement and durability. Proper installation, adjustment, and maintenance of the FH-6800 [paid link] hub are essential for ensuring optimal performance and longevity.

This guide provides a step-by-step breakdown of the installation process, adjustment techniques, and maintenance best practices for the FH-6800 [paid link] hub. Whether you are setting up a new wheel or servicing an existing one, following these instructions will help keep your hub rolling smoothly.

Tools Required

  • 17mm cone wrenches (for bearing adjustment)
  • 5mm Allen key (for cassette removal if necessary)
  • Cassette lockring tool [paid link]
  • Adjustable wrench or torque wrench [paid link]
  • Grease (Shimano Dura-Ace or similar)
  • Degreaser and cleaning rags
  • Spoke wrench (for wheel truing if needed)
  • Freehub body removal tool (optional, if servicing the freehub)

Step-by-Step FH-6800 Hub Installation

1. Preparing the Wheel and Hub

Before installing the hub, ensure that the wheel rim and spokes are properly tensioned. Inspect the hub for any factory lubrication deficiencies and apply grease to the bearing races if necessary.

2. Installing the Cassette

If the hub is new or has been recently serviced, install the cassette onto the freehub body:

  • Slide the cassette cogs onto the freehub, ensuring proper alignment with the splines.
  • Use a cassette lockring tool [paid link] and tighten the lockring to the manufacturer’s recommended torque (typically 30–40Nm).

3. Mounting the Wheel to the Frame

  • Align the hub axle with the rear dropouts and insert the quick-release skewer.
  • Ensure that the wheel sits evenly within the dropouts before tightening the skewer securely.
  • Close the quick-release lever with firm pressure.

Adjusting the FH-6800 Hub Bearings

Proper bearing adjustment is critical for minimizing friction and maximizing hub longevity. The FH-6800 features cup-and-cone bearings, which allow for fine-tuning.

1. Checking for Play or Binding

  • With the wheel installed, hold the rim and rock it laterally to check for play.
  • Spin the wheel and listen for any grinding or roughness.

2. Adjusting the Cone Nuts

  • Remove the wheel and use two 17mm cone wrenches to adjust the cone nuts.
  • Loosen or tighten in small increments to achieve a balance where there is no lateral play but minimal resistance in rotation.
  • Secure the locknuts while holding the cone in position to maintain the adjustment.

FH-6800 Hub Maintenance Guide

Regular maintenance of the FH-6800 hub ensures smooth operation and prevents premature wear. Shimano recommends servicing the hub every 5,000–10,000 km, depending on riding conditions.

1. Cleaning the Hub

  • Remove the wheel and use a degreaser to clean the hub exterior.
  • Wipe down the freehub body to remove dirt and excess lubricant.

2. Re-Greasing the Bearings

  • Disassemble the axle and remove the bearings.
  • Clean the bearing races with a rag and apply fresh grease.
  • Reassemble, ensuring proper bearing preload to avoid excessive friction.

3. Checking and Servicing the Freehub

  • If engagement feels rough or delayed, remove the freehub body using a 10mm Allen key.
  • Flush out old lubricant and apply a light oil to the internal pawls.
  • Reinstall and check for smooth engagement.

Troubleshooting Common FH-6800 Hub Issues

1. Rough or Grinding Bearings

  • Possible Cause: Dirt contamination or lack of lubrication.
  • Solution: Clean and regrease the bearings following the maintenance steps above.

2. Hub Engagement Issues (Skipping or Lagging Freehub)

  • Possible Cause: Dry or worn-out freehub mechanism.
  • Solution: Lubricate the pawls or replace the freehub if necessary.

3. Lateral Play in the Hub

  • Possible Cause: Loose bearing cones or worn-out bearings.
  • Solution: Readjust the cones and inspect for bearing wear.

FH-6800 Hub Longevity and Performance Tips

To maximize the lifespan of your FH-6800 hub:

  • Regularly clean and re-grease the bearings to prevent contamination.
  • Check the bearing preload after each major ride or service.
  • Avoid pressure-washing the hub, as water can force contaminants inside.
  • Replace the freehub body if engagement becomes inconsistent.

Conclusion

Proper installation, adjustment, and maintenance of the Shimano FH-6800 hub are crucial for achieving a smooth and efficient ride. By following the steps outlined in this guide, cyclists can ensure their hub remains in optimal condition for years to come.