BBB BCR-31 Compactgear Chainring - 2909693136
Best current price£41.99from eBay
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eBay£41.99Visit shop BBB CompactGear BCR-31Chainring 110 BCD 48T Shimano 9/10 Speed Dark Grey.
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eBayBBB CompactGear BCR-31Chainring 110 BCD 48T Shimano 9/10 Speed Dark Grey.
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Leisure Lakes BikesBBB BCR-31 Compactgear Chainring Silver
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BBB BCR-31 Compactgear Chainring SilverFree delivery in 1–3 days£59.95Visit shop →
BBB BCR-31 Compactgear Chainring SilverFree delivery in 1–3 days£59.95Visit shop →
BBB BCR-31 Compactgear Chainring SilverFree delivery in 1–3 days£59.95Visit shop →
BBB BCR-31 Compactgear Chainring SilverFree delivery in 1–3 days£59.95Visit shop →
BBB BCR-31 Compactgear Chainring SilverFree delivery in 1–3 days£59.95Visit shop →
BBB BCR-31 Compactgear Chainring SilverFree delivery in 1–3 days£59.95Visit shop →
BBB BCR-31 Compactgear Chainring SilverFree delivery in 1–3 days£59.95Visit shop →
BBB BCR-31 Compactgear Chainring SilverFree delivery in 1–3 days£59.95Visit shop →
BBB BCR-31 Compactgear Chainring SilverFree delivery in 1–3 days£59.95Visit shop →
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eBayBBB Chainring CompactGear 36 Tooth 9/10 Speed 5 Arm Mounting 110mm BCD BCR-31 -H
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Product Information
Full details
The BBB BCR-31 Compactgear Chainring is a high-performance upgrade or replacement component designed for cyclists using compact 5-arm cranksets. Ideal for riders seeking reliable shifting and long-lasting durability, it is constructed from CNC-machined 7075 T6 aluminum. Please note that this specific chainring is engineered for older drivetrain standards, requiring compatibility verification with Shimano systems pre-2009 or SRAM 9/10-speed compact setups.
All features
| Model Part Number | 2909693136 |
|---|---|
| Brand | BBB |
Extended Product Information
FAQs
Is this chainring compatible with 11-speed drivetrains?
No, this model is specifically engineered for SRAM 9/10 speed and Shimano systems up to 2009.
What is the BCD of this chainring?
The BBB BCR-31 features a standard 110 mm BCD.
What material is this chainring made from?
It is constructed from durable, CNC-machined 7075 T6 aluminum.
Can I use this on a 4-arm crankset?
No, this chainring is designed exclusively for 5-arm compact cranksets.
Does it include installation bolts?
No, this package contains the chainring only; you should reuse your existing chainring bolts or purchase replacements if they are worn.
Troubleshooting
Chain skipping or hesitant shifting
Check for compatible chain wear and ensure the chainring is properly aligned and secured to the crank arm.
Chainring bolts coming loose
Remove the bolts, apply a small amount of blue thread-locking compound, and torque to the correct specification.
Pros and Cons
Pros
- Durable CNC-machined construction
- Lightweight yet robust 7075 T6 aluminum
- Ideal for restoring or maintaining older compact drivetrains
- Precise fitment for 110 mm BCD 5-arm setups
Cons
- Limited to specific pre-2009 drivetrain standards
- Not suitable for modern 11-speed or 12-speed systems
- Requires professional installation tools
Setup, Compatibility & Care
Before installation, ensure your crankset is a 5-arm model with a 110 mm Bolt Circle Diameter (BCD). To install, you will need a standard chainring bolt tool and a torque wrench to ensure the bolts are secured to the manufacturer's recommended specifications. Clean the chainring regularly with a degreaser and a stiff brush to remove road grit and lubricant buildup, which will prevent premature wear of the teeth. Always inspect the chainring for signs of shark-finning on the teeth to determine if replacement is necessary after high-mileage use.