SRAM 913-31 Cage Rear Derailleur Xo Carbon 9-SPEED X-0

( Brand: Sram ), ( Manufacturer Part Number: 913-31 ), ( Part Type: Derailleur ), ( Compatible Brand: For Sram ), ( Color: Silver ), ( Compatible Bike Type: Universal, Mountain Bike ), ( Material: Aluminum, Steel ), ( Mounting Type: Bolt-on ), ( Number Of Speeds: 9 Speed ), ( Derailleur Cage Length: Medium Cage ), ( Country Of Origin: Taiwan )

Review SRAM X0 Medium Cage 9-speed Rear Derailleur X-0 Xo Carbon

The **SRAM 913-31 2003 XO Cage 9-Speed Rear Derailleur (X0 XO Carbon)** is a high-performance, precision-engineered drivetrain component designed for cyclists seeking uncompromising shifting efficiency, durability, and weight savings in their road or gravel setups. Built with SRAM s signature **X0 XO Carbon** construction, this derailleur combines the strength of carbon fiber with the lightweight properties of aluminum, delivering an optimal balance of stiffness, vibration dampening, and resistance to fatigue ideal for aggressive riding styles or long-distance tours where every gram matters. The **913-31** model features a **31-tooth limit screw**, which allows for a wider gear range, accommodating everything from steep climbs to fast descents with ease, while the **2003 cage design** ensures smooth, consistent shifting across all 9-speed cassettes, minimizing chain drop and maximizing reliability. The **XO Cage** itself is meticulously crafted with SRAM s **X-Sync** technology, which optimizes chainline alignment and reduces lateral play, resulting in near-instantaneous shifts and reduced wear on both the derailleur and cassette. The **carbon-reinforced pivot points** enhance durability, particularly in rough terrain, while the **anodized aluminum frame** resists corrosion and maintains structural integrity under extreme conditions. Whether paired with a lightweight road bike or a rugged gravel rig, this derailleur exemplifies SRAM s commitment to innovation, offering cyclists a blend of cutting-edge performance and refined engineering that elevates the riding experience. Its sleek, aerodynamic profile and precise build quality make it a standout choice for enthusiasts who demand nothing less than excellence in their drivetrain components.

The SRAM X0 Cage 9-speed rear derailleur from 2003 is a well-regarded component in the cycling community, particularly among enthusiasts who appreciate its performance and durability. Below is a detailed breakdown of its pros and cons, followed by a conclusion and recommendation.

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### **Pros**

1. **Reliability and Durability**

The SRAM X0 Cage was designed for high-performance road racing and has a reputation for being robust. Its carbon fiber cage (XO) is lighter than aluminum while maintaining stiffness, reducing flex under heavy loads. This makes it a durable choice for aggressive riding, including sprinting and climbing. The 2003 model is also older, meaning it has likely been refined over time with updates to the design, though it retains the core strengths of the X0 Cage.

2. **Precision Shifting**

SRAM s 9-speed drivetrain (particularly the X0 series) is known for smooth, consistent shifting. The X0 Cage s design minimizes chain slap and ensures clean shifts even under high stress. This is particularly valuable for racers or riders who demand predictable performance.

3. **Lightweight Construction**

The carbon fiber cage reduces weight compared to aluminum alternatives, which can be beneficial for climbers or riders prioritizing a lighter drivetrain. The overall weight savings can contribute to better handling and efficiency, especially on long rides.

4. **Compatibility with SRAM 9-Speed Systems**

This derailleur is designed to work seamlessly with SRAM s 9-speed cassettes (e.g., 11-28T or 11-32T) and shifters (e.g., Rival, Force, or Red). If you re already using a SRAM 9-speed setup, this derailleur will integrate smoothly without compatibility issues.

5. **Aesthetic Appeal**

The X0 Cage has a distinctive, aggressive look that appeals to riders who value both performance and style. Its carbon fiber cage is visually striking compared to more utilitarian aluminum options.

6. **Vintage Availability and Collectibility**

As a 2003 model, this derailleur may be harder to find in good condition, which can make it a sought-after piece for collectors or riders looking for a specific vintage part. If you re restoring a bike or building a retro-themed rig, this could be a desirable choice.

7. **Proven Performance in Aggressive Riding**

The X0 Cage was popular among professional racers and aggressive riders due to its ability to handle high speeds and sharp shifts. If you ride in a similar style, this derailleur will likely perform well.

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### **Cons**

1. **Age and Potential Wear**

The 2003 manufacturing date means this derailleur is over two decades old. While well-maintained examples can still function perfectly, the risk of internal wear (e.g., worn pulleys, degraded cables, or rusted components) increases over time. Older derailleurs may require more frequent maintenance or adjustments to perform optimally.

2. **Limited Availability of Replacement Parts**

SRAM has since discontinued the 9-speed X0 Cage line in favor of newer technologies (e.g., 10-speed, 11-speed, or eTap systems). Finding original replacement parts (e.g., cages, pulleys, or springs) can be challenging, and prices for genuine SRAM parts may be high. Third-party alternatives exist but may not match the original quality or fit perfectly.

3. **Compatibility with Modern Bikes**

If you re building a bike from scratch or upgrading an older frame, ensure the dropouts and spacing (e.g., 130mm or 135mm cage width) match your bike s requirements. The X0 Cage may not fit modern ultra-compact or gravel bikes designed for wider cassettes or different spacing standards.

4. **Weight Sensitivity in Some Contexts**

While the carbon cage is lighter than aluminum, the overall weight savings may not be significant enough to justify buying a vintage part over a modern, equally lightweight alternative (e.g., SRAM s newer carbon cages or high-end aluminum options). For casual riders, the marginal weight difference may not be worth the added complexity of maintaining an older part.

5. **Maintenance Requirements**

Older derailleurs often require more frequent lubrication and adjustments to compensate for wear. The carbon cage is less prone to rust than aluminum, but other components (e.g., springs, pivots) may need attention. If you re not comfortable with detailed maintenance, this could become a hassle.

6. **Shift Quality with Modern Cassettes**

While the X0 Cage works well with 9-speed cassettes, newer, wider cassettes (e.g., 10-speed or 11-speed) may not shift as cleanly due to differences in spacing and chainline. If you re considering upgrading your cassette in the future, this could become an issue.

7. **Cost of Restoration or Replacement**

If the derailleur is in poor condition, restoring it to working order may require significant time, money, or specialized tools. In some cases, it may be more cost-effective to replace it with a newer, reliable derailleur rather than invest in a vintage part.

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### **Conclusion**

The SRAM X0 Cage 9-speed rear derailleur from 2003 is a high-quality, performance-oriented component that excels in reliability, shifting precision, and lightweight construction. It remains a favorite among riders who appreciate its vintage appeal, durability, and aggressive design. However, its age introduces challenges related to part availability, maintenance demands, and compatibility with modern setups. If you re restoring a classic bike, building a retro-themed rig, or have a specific need for a vintage SRAM part, this derailleur can be an excellent choice. For most modern riders, especially those who prioritize ease of maintenance and future compatibility, a newer derailleur (e.g., SRAM s current carbon or aluminum options) may be a more practical investment.

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### **Recommendation**

- You re restoring or building a vintage-style bike and want an authentic, high-performance part.

- You re a serious racer or aggressive rider who values the X0 Cage s shifting precision and durability.

- You have experience maintaining older components and are willing to invest time in upkeep.

- You find a well-documented, high-quality example in good condition and can justify the potential long-term costs.

- You re building a modern bike and need compatibility with wider cassettes or newer drivetrain standards.

- You prioritize ease of maintenance and want access to modern replacement parts.

- You re on a budget and can find a reliable newer derailleur (e.g., SRAM Force, Rival, or Red) at a comparable or lower cost.

- You re not comfortable with the added complexity of maintaining a vintage part.

For most riders today, a newer SRAM derailleur (e.g., a carbon or aluminum 10/11-speed option) will offer better long-term reliability and compatibility without sacrificing performance. However, if you re drawn to the X0 Cage s heritage and can meet its demands, it remains a fantastic choice for the right project.

Details:

Made with a combination of aluminum and steel, this silver rear derailleur from SRAM features medium cage length for optimal gear shifting performance. Built in Taiwan, this rear derailleur is a reliable and durable option for serious riders. The 2003 SRAM X0 Medium Cage 9-Speed Rear Derailleur is a high-quality bike component designed for mountain bikes.

part #: 91331 prices

• $79.99-$185.00

specifications ribicycl:

• brand: Sram
• mpn: 913-31
• part type: Derailleur
• compatible brand: For Sram
• color: Silver
• compatible bike type: Universal, Mountain Bike
• material: Aluminum, Steel
• mounting type: Bolt-on
• number of speeds: 9 Speed
• derailleur cage length: Medium Cage
• country of origin: Taiwan

seller ribicycl:

• city: Poway, California
• rating: 99.4%
• # reviews: 223

payments ribicycl:

• wallet: Apple-pay
• other
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returns ribicycl:

• policy: No Returns

offer ribicycl:

• options: Ship-to-home
• availability: In Stock
• started: June 3, 2026
• sold: 0
• quantity: 1
• best offers: True

shipping ribicycl:

• transit: 5-7 Days
• cost: $0.00
• class: Economy
• type: Calculated
• service: UPS Ground Saver
• carrier: UPS

general ribicycl:

• Cycling > Bicycle Components Parts > Rear Derailleurs
• condition: Used

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