Shimano SG-8R20 Nexus dust cap - Right Hand - 34R0E00
Not Available
Currently unavailable
Currently out of stock
This product is not available at the moment. Check back later.
Product Information
Full details
The Shimano SG-8R20 Nexus dust cap (34R0E00) is a genuine replacement component designed specifically for bicycle mechanics and riders maintaining the Shimano SG-8R20 Nexus internal gear hub system. It serves as the critical 'B-type' dust shield for the right-hand side of the hub, effectively sealing internal bearings against grit, mud, and water ingress. While it is a simple snap-in part, it requires precision during installation to ensure a flush fit for optimal hub longevity; users must verify their hub model number as this component is not cross-compatible with other Nexus series hubs.
All features
| Model Part Number | 34R0E00 |
|---|---|
| Brand | Shimano Spares |
Extended Product Information
FAQs
Is this part compatible with my Shimano Alfine hub?
No, this dust cap is specifically designed for the Shimano SG-8R20 Nexus hub and is not compatible with Alfine or other Nexus series models.
Do I need special tools to install this cap?
No, it is a press-fit component that can be installed by hand.
What does the 'B-type' designation mean?
The B-type designation refers to the specific geometry and size of the seal designed for the right-hand side of the SG-8R20 hub shell.
How often should I replace this dust cap?
It should be replaced if you notice cracks, significant wear, or if the cap no longer sits snugly against the hub shell.
Does this cap prevent water from getting into the gears?
It provides a protective barrier against debris and light spray, but it is not a fully hermetic waterproof seal.
Can I use silicone grease on the seal?
A very light coating of silicone grease can help the seal sit better and provide an extra layer of moisture protection, but ensure it does not attract excessive grit.
Troubleshooting
The cap will not snap into place.
Check the hub surface for remnants of the old gasket or hardened dirt. Ensure the cap is not being inserted at an angle.
The cap keeps popping out after a short ride.
Verify that the hub shell is not cracked or deformed at the seating point and that you are using the correct B-type cap for the SG-8R20 model.
Pros and Cons
Pros
- Ensures factory-standard protection for internal hub gears
- Easy to install without professional workshop tools
- Cost-effective solution to prevent premature hub failure
- High-quality material resists common trail and road debris
Cons
- Compatibility is restricted to the SG-8R20 model only
- Plastic construction can become brittle after years of extreme UV exposure
- Does not include internal seals or lubricants
Setup, Compatibility & Care
Before installation, ensure the right-hand side of the hub shell is clean and free of old, hardened grease or dirt residue. Remove the old cap carefully using a non-marring plastic pick to avoid scratching the hub casing. Align the new B-type cap and press it firmly into position until you hear or feel a positive engagement. The cap should sit flush with the hub shell. For long-term care, occasionally wipe the area around the cap with a clean cloth during your routine chain cleaning to prevent grit from building up at the seal interface. This part is strictly compatible with the Shimano SG-8R20 hub; attempting to force it into other models may result in improper sealing or permanent damage to the plastic component.