Sram Road Chainring - 39T - Black
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Product Information
Full details
This guide is for cyclists seeking to optimize their drivetrain performance, particularly those using SRAM Red Yaw front derailleurs. The key benefit is enhanced shifting efficiency through its durable construction and PowerGlide ramp design. A potential caveat is ensuring compatibility with specific crankset bolt circle diameters. This 39-tooth chainring, made from 7075 T6 aluminum with a hard-anodized finish, is designed for optimized shifting, featuring PowerGlide ramps and pins. It's suitable for replacing older black rings and is compatible with SRAM Red Yaw front derailleurs, featuring a 130mm Bolt Circle Diameter (BCD).
All features
| Model Part Number | 11.6218.000.001 |
|---|---|
| Brand | Sram Road |
Extended Product Information
FAQs
What does 130mm BCD mean?
BCD stands for Bolt Circle Diameter. It's the diameter of the circle formed by the center of the bolts that attach the chainrings to the crankset spider. A 130mm BCD means the distance across the crankset spider, passing through the center of the crank arm and the chainring bolt holes, is 130mm.
Can I use this chainring with a Shimano front derailleur?
While theoretically possible in some setups, it is not recommended. This chainring is specifically designed for optimal performance with SRAM Red Yaw front derailleurs. Using it with a non-compatible derailleur may result in poor shifting and drivetrain issues.
What is the advantage of a 39-tooth chainring?
A 39-tooth chainring offers a smaller front chainring option compared to standard 50 or 52-tooth rings, providing easier pedaling. This is beneficial for climbing steep gradients or for riders who prefer a lower gear range for sustained effort.
How do I know if my crankset is compatible?
You need to measure the Bolt Circle Diameter (BCD) of your current crankset. For this chainring, you must have a 130mm BCD. Check your crankset's specifications or measure the distance between the bolt holes.
What is the difference between this black ring and older black rings?
Newer black rings, like this one, are made from 7075 T6 aluminum with a hard-anodized finish and PowerGlide ramps for optimized shifting. Older rings may have different materials or shifting ramp designs.
Do I need special tools to install this chainring?
You will need standard Allen wrenches (hex keys) to remove and install the chainring bolts. Ensure you have the correct size Allen wrench for your specific chainring bolts and crankset.
Troubleshooting
Chain skipping or poor shifting performance
Ensure the chainring is correctly installed with proper torque. Check that the front derailleur is properly aligned and adjusted for the 39T chainring. Verify chain wear and compatibility with the rest of your drivetrain.
Chainring bolts feel loose
Tighten chainring bolts to the manufacturer's recommended torque specification. If bolts continue to loosen, inspect bolt threads and crank arm threads for damage; consider replacing bolts if necessary.
Chain rubbing on front derailleur cage
Adjust the limit screws and cable tension on your front derailleur. Ensure the chainline is optimized for your crankset and bottom bracket combination.
Pros and Cons
Pros
- Durable construction for long-term use.
- Smooth and efficient shifting performance.
- High-quality hard-anodized finish.
- Designed for specific SRAM derailleur compatibility.
- Good option for replacing older chainrings.
Cons
- Specific 130mm BCD may limit crankset compatibility.
- May require a compatible SRAM Red Yaw front derailleur for optimal performance.
- 39T might not suit all riding styles or terrains without proper gearing context.
Setup, Compatibility & Care
Setup: Ensure your crankset has a 130mm Bolt Circle Diameter (BCD). The chainring should be mounted using appropriate chainring bolts and nuts, ensuring it is securely fastened to the crank arm spider. Proper torque specifications for chainring bolts should be followed to prevent damage or loosening.
Compatibility: This chainring is designed for use with SRAM road drivetrains, specifically compatible with SRAM Red Yaw front derailleurs. Verify your existing crankset BCD is 130mm. It can serve as a direct replacement for older black SRAM chainrings within compatible systems.
Care: Clean the chainring regularly with a mild degreaser and water. Use a soft brush or cloth to remove dirt and grime from the teeth and ramps. Dry thoroughly after cleaning. Avoid abrasive cleaners or high-pressure washing, which can damage the finish and impact shifting performance.