microSHIFT R9 Rear Derailleur Instruction Manual

1. Introduction

The microSHIFT R9 Rear Derailleur is engineered for 9 and 10-speed road bicycle drivetrains. It features a medium cage design, suitable for double chainring setups with a largest cog of up to 34 teeth. Constructed with an aluminum bracket body and outer link for weight savings, and a steel pulley cage for durability, this derailleur provides reliable shifting performance. This manual provides essential information for proper installation, operation, and maintenance to ensure optimal function and longevity of your component.

2. Safety Information

• Professional installation by a qualified bicycle mechanic is recommended.
• Always use appropriate tools for installation and adjustment.
• Ensure all bolts are tightened to the manufacturer's specified torque settings. Overtightening or undertightening can lead to component failure or injury.
• Regularly inspect the derailleur for signs of wear, damage, or loose components.
• Keep hands and clothing clear of moving parts during operation.

3. Package Contents

• One (1) microSHIFT R9 Rear Derailleur (Model RD-R43M)

4. Setup and Installation

4.1 Mounting the Derailleur

Attach the derailleur to the derailleur hanger on your bicycle frame. Ensure the B-bolt is properly seated and tighten the mounting bolt to the manufacturer's recommended torque specification. The derailleur should be securely fixed and not rotate freely.

4.2 Cable Installation and Adjustment

Route the shift cable through the appropriate housing and guides on your frame, then secure it to the derailleur's cable fixing bolt. Adjust cable tension using the barrel adjuster to achieve smooth and precise shifting across all gears. Ensure the cable is taut but not excessively tight.

4.3 Limit Screw Adjustment

The derailleur features two limit screws, typically marked 'H' (High) and 'L' (Low). These screws prevent the derailleur from shifting the chain off the smallest or largest cog, respectively. Adjust the 'H' screw so the upper guide pulley aligns with the center of the smallest cog when the chain is on it. Adjust the 'L' screw so the upper guide pulley aligns with the center of the largest cog when the chain is on it. Fine-tune these adjustments to prevent over-shifting.

4.4 Compatibility Notes

This derailleur is compatible with 9 and 10-speed road systems. It is not compatible with Shimano Tiagra 4700 road systems.

Figure 1: The microSHIFT R9 Rear Derailleur (Model RD-R43M) in black, featuring its aluminum body, steel pulley cage, and medium cage design. The 'R9 microSHIFT' branding is visible on the main body, and 'Mega sprocket' is printed on the cage.

5. Operation

The microSHIFT R9 Rear Derailleur operates in conjunction with compatible 9 or 10-speed road shifters. To change gears, actuate your shifter according to its specific instructions. The derailleur will move the chain to the desired cog on the cassette. Ensure smooth and consistent shifting by maintaining proper cable tension and clean components.

6. Maintenance

6.1 Cleaning

Regularly clean the derailleur, especially the pulleys and cage, to remove dirt, grime, and old lubricant. Use a mild degreaser and a brush, then rinse thoroughly with water. Dry the component completely after cleaning.

6.2 Lubrication

After cleaning, apply a small amount of bicycle-specific lubricant to the pivot points of the derailleur and the pulley bearings. Avoid over-lubrication, which can attract dirt.

6.3 Inspection

Periodically inspect the derailleur for bent components, cracks, or excessive play in the pivots. Check the pulley wheels for wear and ensure they spin freely. Replace any damaged or excessively worn parts immediately.

7. Troubleshooting

• Poor Shifting: Check cable tension, limit screw adjustments, and ensure the derailleur hanger is not bent. A bent hanger is a common cause of poor shifting.
• Chain Rub: Verify limit screw settings and B-tension adjustment (if applicable). Ensure the chain is clean and properly lubricated.
• Noise: Inspect for dirt in the pulleys, worn pulley bearings, or insufficient lubrication. Check for chain rub against the derailleur cage.
• Derailleur Not Moving: Check for seized pivots, damaged cable, or excessive dirt buildup.

If issues persist after basic troubleshooting, consult a qualified bicycle mechanic.

8. Specifications

9. Warranty and Support

This microSHIFT product is covered by a limited warranty. For specific details regarding the warranty period and terms, please refer to the warranty information provided with your purchase or visit the official microSHIFT website. For technical assistance, troubleshooting beyond this manual, or warranty claims, please contact microSHIFT customer support or your authorized microSHIFT dealer.