This article will explain how to repair a freewheel, either by cleaning or replacing it altogether, on all Enviolo hubs.

Backward compatibility

This guide is compatible with legacy Enviolo and NuVinci hubs.

Step-by-step instructions

Video

Tools

• Small flat screwdriver
• Cleaning solution
• Medium-weight oil
• Freewheel kit

Instructions

1 - Disassembly

1. Set the hub in full overdrive, prior to the removal of the hub interface.
2. Remove the hub interface.
3. Remove the sprocket snap ring.
4. Remove the sprocket spacer (if installed).
5. Remove the sprocket.
6. Remove the snap ring (A) on the shift driver.
7. Remove the freewheel body (B).
   
8. Remove the interior snap ring (C).
9. Remove the right-hand shield (D).
10. Remove the needle bearing (E).
    

2 - Cleaning

Once the freewheel parts have been removed, service the inside:

1. Use a medium-weight oil or very lightweight water-resistant grease to clean the interior of the hub, so no metal scraps or dirt is left inside.
2. Check the pawl and spring function.
3. Reinstall using a medium-weight oil.

3 - Assembly

Now, reassemble the freewheel parts. Use new parts if the old ones are defective:

1. Replace the plastic washer to cover the bearing seal (for the new freehub body with plastic washer).
2. Place a new needle bearing (E).
3. Place a new right-hand shield (D).
4. Secure with the snap ring.
5. Assemble the new freewheel body (B).
6. Assemble the snap ring (A) on the shift driver.

Next step

If you successfully follow the steps above, then the freewheel is serviced and repaired. You can now reassemble the sprocket back onto the hub: How to assemble the sprocket on a hub