Shimano Spares RD-M5120 Right Outer Plate Assembly, SGS-type
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Product Information
Full details
This guide is for cyclists who need to replace a damaged or worn right outer plate on their Shimano RD-M5120 rear derailleur. It provides a genuine Shimano replacement part to restore full shifting performance, but requires careful installation to ensure proper function. This part is specifically the SGS-type outer plate assembly.
All features
| Model Part Number | Y3HM98070 |
|---|---|
| Brand | SHIMANO |
Extended Product Information
FAQs
Is this part compatible with other Shimano derailleur models?
No, this right outer plate assembly is specifically designed for the Shimano RD-M5120 rear derailleur.
What does 'SGS-type' mean?
SGS-type refers to a long cage rear derailleur, which typically has a greater chain wrap capacity and is suitable for a wider range of gear ratios.
Do I need special tools to install this part?
Installation requires standard bicycle tools for derailleur service, potentially including hex wrenches, screwdrivers, and possibly specialized derailleur tools depending on the disassembly process outlined in the service manual.
Can I just buy this part and install it myself?
If you have experience with bicycle maintenance and derailleur repair, yes. Otherwise, it is recommended to have a qualified bicycle mechanic perform the installation.
What if my original outer plate was bent, not broken?
A bent outer plate can cause the same shifting issues as a broken one. Replacing it with a new, straight genuine part will correct the alignment and restore performance.
Does this part come with instructions?
This part is a replacement component and typically does not include installation instructions. It is best to refer to the official Shimano service manual for the RD-M5120 derailleur for detailed guidance.
Troubleshooting
Shifting is still poor after replacement.
Ensure the outer plate was installed correctly and all derailleur screws/bolts are properly torqued. Check derailleur hanger alignment and B-tension adjustment.
Derailleur cage feels loose.
Verify that all internal pivot bolts and springs are correctly seated during reassembly.
Difficulty fitting the new plate.
Confirm you have the correct SGS-type plate for the RD-M5120 and that no other parts are obstructing the fit.
Pros and Cons
Pros
- Authentic Shimano part for guaranteed fit and quality.
- Restores precise shifting when the original plate is damaged.
- Specific design for RD-M5120 derailleur model.
- Durable construction for longevity.
Cons
- Requires mechanical knowledge for installation.
- Does not include other derailleur components.
- Only compatible with the specific RD-M5120 derailleur.
- SGS-type specific; may not fit other cage lengths.
Setup, Compatibility & Care
Compatibility: This part is exclusively designed for the Shimano RD-M5120 rear derailleur and is the SGS-type (long cage) version. Ensure your derailleur model matches before purchase. It is a component replacement and not a complete derailleur.
Setup: Installation requires disassembly of the rear derailleur. It is recommended to consult the official Shimano service manual for the RD-M5120 for detailed step-by-step instructions. Key steps typically involve removing the derailleur from the bike, carefully disassembling the derailleur body, replacing the outer plate, and reassembling. Proper tensioning of the derailleur's springs and correct reinstallation are critical.
Care: As a metal component, it requires minimal direct care. However, keeping the entire drivetrain clean and lubricated will prolong the life of this part and the derailleur as a whole. Avoid harsh chemicals that could damage surrounding components.