The Shimano HB-6800 [paid link] front hub, part of the Ultegra 6800 series, is designed for road cyclists who demand smooth rolling, durability, and lightweight performance. Proper installation, adjustment, and maintenance are crucial for extending the lifespan of the hub and ensuring a smooth ride.
This guide covers every aspect of the Shimano HB-6800 [paid link] hub, including installation, bearing adjustment, routine maintenance, and troubleshooting common issues.
Tools Required
To install and service your Shimano HB-6800 [paid link] hub, you will need:
- 5mm hex keys [paid link]
- 17mm cone wrenches
- Grease (Shimano Dura-Ace or equivalent)
- Clean rag or paper towels
- Isopropyl alcohol (for cleaning)
- Bearing balls (if replacing)
- Torque wrench [paid link]
1. Shimano HB-6800 Hub Installation
1.1 Pre-Installation Preparation
Before installing the HB-6800 hub, check that the wheel is properly dished and that the hub’s bearings are clean and well-greased. If the hub is new, lightly grease the axle ends to prevent seizing.
1.2 Installing the Hub into the Fork
- Insert the HB-6800 hub into the front fork dropouts.
- Position the quick-release skewer through the axle, ensuring that the cam lever is on the non-drive side.
- Tighten the skewer while keeping the wheel centered. The quick-release lever should close with moderate resistance.
- Spin the wheel and check for any rubbing against the brake pads. If necessary, realign the hub within the fork dropouts.
1.3 Torque and Final Check
- Ensure that the quick-release skewer is tightened securely but not overly tight.
- Confirm that the wheel spins freely without resistance.
2. Adjusting the Bearings on the Shimano HB-6800 Hub
The HB-6800 uses traditional cup-and-cone bearings, requiring periodic adjustment for smooth rolling.
2.1 Checking for Play or Resistance
- Hold the fork and try to move the wheel side to side. If there is noticeable play, the bearings are too loose.
- If the wheel feels rough or doesn’t spin freely, the bearings may be too tight.
2.2 Adjusting the Cone Bearings
- Use a 17mm cone wrench [paid link] to hold the cone while loosening the locknut on one side.
- Gently tighten or loosen the cone until play is eliminated without introducing excessive resistance.
- Re-tighten the locknut while holding the cone in place.
- Spin the wheel and ensure smooth rotation without binding.
3. Shimano HB-6800 Hub Maintenance
3.1 Cleaning the Bearings
Regular cleaning and greasing of the HB-6800 hub bearings prevent premature wear and rough rolling.
- Remove the quick-release skewer and axle assembly.
- Use isopropyl alcohol and a clean rag to wipe the bearing surfaces.
- Inspect the bearings for pitting or wear. Replace if necessary.
3.2 Repacking with Grease
- Apply a generous layer of high-quality grease to the cup and cone surfaces.
- Reinstall the bearings carefully, ensuring even distribution.
- Reassemble the axle and adjust the bearing preload as described in section 2.2.
4. Troubleshooting Common Shimano HB-6800 Hub Issues
4.1 Loose or Noisy Bearings
If your hub develops play or makes a clicking sound, the cone bearings may be too loose. Follow the adjustment procedure in section 2.2.
4.2 Draggy or Rough Spinning
Excessive grease, contamination, or overly tight bearings can cause drag. Disassemble the hub, clean the bearings, and reset the preload.
5. Extending the Lifespan of Your Shimano HB-6800 Hub
5.1 Regular Inspection
- Check for bearing play or roughness every 1,500-2,000 miles.
- Clean and regrease bearings at least once a year or after riding in wet conditions.
5.2 Avoiding Contamination
- Use sealed bearings or dust caps to keep debris out.
- Avoid excessive pressure washing near the hub.
5.3 Quick-Release Maintenance
- Apply a small amount of grease to the quick-release skewer threads to prevent corrosion.
- Ensure the skewer is always properly tensioned to prevent axle wear.
Conclusion
The Shimano HB-6800 hub is a high-quality, durable component that, when properly maintained, provides years of smooth performance. Regular bearing adjustments, cleaning, and lubrication are essential to keeping it running optimally.
By following the steps in this guide, you can ensure that your hub remains in top condition, avoiding unnecessary wear and performance iss