Shimano RD-M781 Inner Plate - SGS - 6308512
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Product Information
Full details
The Shimano RD-M781 Inner Plate (SGS, MPN: 6308512) is a specialized factory replacement component designed for bicycle mechanics and riders maintaining their own Shimano RD-M781 rear derailleurs. It offers the exact structural integrity required to restore precise indexing and shifting accuracy to an SGS long-cage drivetrain system, though users must verify their specific derailleur cage length prior to installation as compatibility is strictly model-dependent.
All features
| Model Part Number | 6308512 |
|---|---|
| Brand | Tomoayax OEM Vehicle Parts Japan |
Extended Product Information
FAQs
Is this compatible with an RD-M780 derailleur?
This part is designed specifically for the RD-M781. Please cross-reference the part number 6308512 with your specific derailleur model to confirm compatibility.
Does this come with pulley wheels?
No, this listing is for the inner plate only. Existing pulley wheels must be transferred over.
How do I know if I have an SGS cage?
The 'SGS' designation usually refers to the long-cage version. You can confirm this by checking the derailleur model stamp on the back of the body or by measuring the distance between the center of the two pulley wheels.
Can I use this on a 9-speed system?
The RD-M781 is a 10-speed component. Mixing parts across different speed systems is generally not recommended as cage geometry and chain width requirements differ.
What tools are needed for installation?
You will typically need a set of metric hex wrenches (Allen keys) to remove the cage bolts and potentially a chain tool to break the chain for easier access.
Is the part made of aluminum or steel?
The plate is constructed to the specific material standards required for the RD-M781 to balance weight and durability.
Troubleshooting
Derailleur cage remains stiff after installation
Verify that the cage pivot spring is correctly indexed and not binding against the new plate.
Poor shifting after replacing the plate
Ensure the pulley wheels are correctly aligned and that the derailleur hanger has not been bent by the same impact that damaged the original plate.
Pros and Cons
Pros
- Ensures perfect shifting accuracy with genuine Shimano-compatible specs
- Restores the performance of an expensive derailleur at a fraction of the replacement cost
- High-quality construction from certified OEM supplier
- Retains original factory geometry for consistent chain line
Cons
- Compatible only with SGS cage variations of the RD-M781
- Requires advanced mechanical skills for proper derailleur disassembly and reassembly
- Does not include mounting hardware or tension springs
- No manufacturer-provided fitment confirmation, requiring user verification via part number
Setup, Compatibility & Care
To install this part, you must safely remove the derailleur from the bike frame. Place the derailleur on a clean work surface and use the appropriate hex keys to loosen the cage pivot and pulley bolts. When installing the new inner plate, ensure that the tension spring is seated correctly within the cage pivot housing.
Compatibility Note: Always verify that your derailleur is marked as 'SGS' (long cage). This part will not fit short or medium cage versions of similar derailleurs. Regularly inspect the plate for signs of stress marks or bending after significant off-road rides to prevent premature failure. Keep the pivot points lightly lubricated to reduce friction.