Shimano SG-8R20 Nexus Ball Retainer - 3/16 x 13
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Product Information
Full details
The Shimano SG-8R20 Nexus Ball Retainer is an essential maintenance component designed for cyclists and mechanics performing service on Shimano SG-8R20 internal gear hubs. This genuine replacement part restores smooth rotation and precision to the hub internals, ensuring optimal gear engagement and performance. While it is a critical piece for hub longevity, note that it requires specific mechanical knowledge to disassemble the hub housing without damaging internal components.
All features
| Model Part Number | SG-8R20 |
|---|---|
| Brand | Shimano Spares |
Extended Product Information
FAQs
Is this part compatible with other Shimano Nexus models?
This retainer is specifically designed for the SG-8R20 hub. Check your hub model number before purchase, as other Nexus hubs use different bearing sizes.
How often should I replace the ball retainer?
There is no set mileage, but it should be inspected during every major hub service or if you notice abnormal noise or friction.
Do I need special tools to install this?
You will need a set of cone wrenches, a Shimano hub grease tool, and potentially a lockring tool to disassemble the hub internals.
Should I use standard axle grease?
It is highly recommended to use genuine Shimano internal gear hub grease or a high-quality synthetic lithium grease to ensure longevity.
What does the 3/16 x 13 specification mean?
It indicates the ball bearing diameter is 3/16 of an inch and there are 13 balls held within the retainer ring.
Troubleshooting
Hub feels gritty after installation
Verify that no debris or old grease was trapped in the bearing race and ensure you used sufficient fresh lubricant.
Ball retainer does not sit flush
Check that you are using the correct race surface and that the retainer is oriented with the balls facing the contact surface of the hub.
Pros and Cons
Pros
- Ensures factory-standard fitment
- Restores smooth bearing movement
- Prevents internal hub damage from worn bearings
- Reliable, long-lasting construction
Cons
- Requires complete hub disassembly to install
- Specific to SG-8R20 models only
- Requires specialized grease for proper installation
Setup, Compatibility & Care
Installation of the Y-34R98070 ball retainer should only be performed when the internal gear unit has been removed from the hub shell. Ensure the hub internals are clean of old, contaminated grease before installing the new retainer. Use high-quality, bicycle-specific synthetic grease to coat the balls and the bearing race thoroughly. This part is exclusively compatible with the Shimano SG-8R20 Nexus hub; do not attempt to force it into non-compatible hubs as it may result in catastrophic internal failure. After installation, verify that the unit rotates freely before reinserting it into the hub shell.