The Shimano FH-5800 [paid link] hub is a reliable and durable component that performs well in a variety of cycling conditions. However, like all bike components, regular maintenance is necessary to keep it functioning smoothly. One of the most crucial aspects of hub maintenance is ensuring the bearings are in good condition. In this guide, we will walk you through how to service the bearings in your Shimano FH-5800 [paid link] hub, improving its overall performance and extending its lifespan.
Why Bear Service is Important for Your Shimano FH-5800 Hub
The bearings in your Shimano FH-5800 [paid link] hub play a key role in the smooth and efficient rotation of your wheel. Over time, these bearings can wear out due to constant friction, dirt, moisture, and lack of proper lubrication. When the bearings start to fail, you may notice symptoms such as rough spinning, a grinding noise, or increased resistance when pedaling. Servicing the bearings can prevent these issues, enhance your hub’s performance, and save you from costly replacements.
Tools Required
- Shimano FH-5800 hub service kit (or equivalent)
- Cone wrenches (for removal of cones)
- 10mm socket wrench
- Grease (high-quality bike-specific grease)
- Cleaning solvent or degreaser
- Rags
- Replacement bearings (if necessary)
- Bearing press [paid link] tool (if replacing bearings)
Step-by-Step Guide for Servicing the Bearings in Your Shimano FH-5800 Hub
1. Remove the Rear Wheel
To access the FH-5800 hub, the first step is to remove the rear wheel from the bike. Shift your bike to the smallest cog to relieve tension on the rear derailleur and make removal easier. Unscrew the quick release or remove the axle bolts, and then carefully pull the wheel out of the frame.
2. Disassemble the Hub
Once the wheel is removed, it’s time to disassemble the hub. Use a cone wrench [paid link] to loosen and remove the locknut and cones on both sides of the hub. Keep track of the order and orientation of each part as you remove it, as this will be important during reassembly. Use the 10mm socket wrench to remove the freehub body and expose the internal components.
3. Clean the Hub Components
Before inspecting or replacing the bearings, it’s important to thoroughly clean the hub. Use a degreaser or solvent to remove any grime, dirt, and old grease from the hub body, axle, and bearing areas. Wipe everything clean with a rag and ensure that there is no debris that could interfere with the bearing installation.
4. Inspect the Bearings
Once the hub is clean, carefully examine the bearings. The Shimano FH-5800 hub uses cartridge-style bearings, which are sealed units. Look for signs of wear such as pitting, rough spots, or discoloration. If the bearings feel gritty or rough when rotated by hand, they need to be replaced. You can check the freehub body for any signs of wear or play as well.
5. Replace the Bearings (If Necessary)
If the bearings need to be replaced, carefully remove the old bearings from the hub. Use a bearing press [paid link] tool to press the new bearings into place. It’s important to ensure that the bearings are installed correctly, with the sealed side facing outward to protect against moisture and dirt. Shimano FH-5800 hubs require specific bearing sizes, so ensure you are using the correct replacement parts.
6. Lubricate the Bearings and Components
Once the bearings are replaced or inspected, apply a generous amount of high-quality bike grease to the new bearings and other moving parts inside the hub. Grease will reduce friction, prevent rust, and keep the bearings running smoothly. Be sure to grease the cones and locknuts as well, ensuring they are adequately lubricated before reassembly.
7. Reassemble the Hub
Once the bearings are serviced and the components are properly lubricated, begin reassembling the hub. Start by carefully re-installing the freehub body, cones, and locknuts in the correct order. Use the cone wrenches to tighten the cones until they are snug, ensuring the correct preload on the bearings. Do not overtighten, as this can cause excessive friction and reduce bearing lifespan.
8. Reinstall the Rear Wheel
After reassembling the hub, reinstall the wheel onto the bike frame. Make sure the axle is properly aligned and secured. Tighten the quick release or axle bolts, and double-check that the wheel is properly centered in the frame. It’s also a good time to check the braking surface and ensure that your brake pads are aligned and in good condition.
9. Test the Hub
Before heading out on a ride, spin the wheel and listen for any unusual sounds. The wheel should spin smoothly without resistance or grinding noises. If you notice any irregularities, you may need to go back and adjust the bearing preload or check for other issues in the hub.
Common Issues with Shimano FH-5800 Hub Bearings
While servicing your Shimano FH-5800 hub, there are a few common issues you may encounter:
- Gritty or Rough Bearings: If the bearings feel gritty or rough when turning, it’s a sign they need to be replaced. You may also notice grinding noises when riding, especially when freewheeling.
- Excessive Play in the Hub: If there is excessive play or wobbling in the hub, it could indicate that the cones are not adjusted correctly or that the bearings have worn out. Check the cone adjustment and make sure it’s not too tight or too loose.
- Freehub Issues: If your freehub is not engaging correctly, it may be due to worn-out bearings or internal components. Ensure that all parts are clean, properly lubricated, and correctly assembled.
Conclusion
Properly servicing the bearings in your Shimano FH-5800 hub is crucial for maintaining smooth performance and extending the lifespan of your bike’s drivetrain. By following these detailed steps, you can ensure that your hub is well-maintained and continues to perform at its best. Whether you’re a beginner or experienced cyclist, taking the time to service your hub regularly will help prevent costly repairs and improve your overall riding experience.