Shimano FH-RS770 Left Hand Lock Nut and Cone - Y3EX98020
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Product Information
Full details
The Shimano FH-RS770 Left Hand Lock Nut and Cone (Y3EX98020) is designed for cyclists and professional mechanics performing hub maintenance on the FH-RS770 disc brake hub. As a genuine OEM replacement part, it restores proper hub rotation and bearing preload to ensure long-term reliability and factory-spec performance. Users should note that precise installation is required to avoid damaging the cone or race, and specialized cone wrenches are necessary for the adjustment process.
All features
| Model Part Number | Y3EX98020 |
|---|---|
| Brand | Shimano Spares |
Extended Product Information
FAQs
Is this part compatible with other Shimano hubs?
No, this specific part (Y3EX98020) is designed exclusively for the FH-RS770 hub.
Do I need special tools for this installation?
Yes, you will need thin-profile cone wrenches to hold the cone while tightening the lock nut.
What part number is this in the Shimano diagram?
This is part number 5 in the official FH-RS770 exploded view diagram.
Should I replace the bearings at the same time?
It is highly recommended to replace or inspect your ball bearings whenever replacing the cone to prevent damage to the new part.
How do I know if my cone needs replacing?
If you notice pitting, grooves, or visible wear on the bearing surface of the cone, it should be replaced.
Troubleshooting
The wheel feels stiff or 'notchy' after installation
The cone is adjusted too tightly. Back off the cone slightly using cone wrenches and re-check the bearing play.
There is still side-to-side play in the wheel
The cone is too loose. Re-adjust the cone further inward until the play is eliminated while ensuring the wheel spins freely.
Pros and Cons
Pros
- Guaranteed compatibility with FH-RS770 hubs
- Restores smooth bearing movement
- High-grade factory material quality
- Standardized part for professional workshop use
Cons
- Requires specific cone wrenches for adjustment
- Must be installed with precision to avoid bearing damage
- Not compatible with other hub models
Setup, Compatibility & Care
To install the Y3EX98020, you must first remove the rear wheel and the axle assembly from the FH-RS770 hub. Use two thin-profile cone wrenches to loosen the existing lock nut, then unscrew the assembly. Clean the axle threads and surrounding hub shell thoroughly to remove old grease and debris before installing the new component. Hand-thread the new cone to avoid cross-threading, then tighten the lock nut against the cone while ensuring the bearing adjustment is free of play but not binding. Regular care involves checking for bearing looseness periodically, especially after riding in wet conditions, and repacking the bearings with fresh grease during annual maintenance intervals.