SRAM 277813014 Eagle Cassette Xd Driver Mtb 50/10T

( Brand: Sram ), ( Manufacturer Part Number: 277813014 ), ( Part Type: Cassette Driver ), ( Compatible Brand: For Sram ), ( Color: Multicolor, Black ), ( Compatible Model: Eagle ), ( Material: Steel ), ( Set Includes: Cassette/freewheel ), ( Smallest Sprocket: 10 Tooth ), ( Number Of Speeds: 12 Speed ), ( Freehub/driver Type: Sram Xd ), ( Largest Sprocket: 50 Tooth ), ( Compatible Bike Type: Mountain Bike )

Review SRAM Eagle Technology Speed Cassette Xd Driver 50/10t Mtb

The **SRAM Eagle 12-Speed XD Driver 50/10T MTB Cassette (Part #277813014)** is a high-performance, precision-engineered drivetrain component designed to deliver unmatched shifting efficiency, durability, and versatility for modern mountain biking. Part of SRAM s revolutionary Eagle system, this cassette is built to maximize power transfer, reduce chain wear, and provide seamless gear engagement across a wide range of terrains from aggressive downhill descents to technical climbs. The **50/10T** ratio offers a balanced spread, with a compact 10-tooth smallest sprocket for efficient pedaling on steep ascents and a 50-tooth largest cog for effortless cruising on flat or rolling terrain, making it ideal for riders seeking both climbing prowess and downhill speed. The **XD (eXtreme Durability) driver** ensures a secure, corrosion-resistant fit, accommodating the full 12-speed Eagle chain and cassette while maintaining optimal chainline alignment for smooth operation.

Crafted from SRAM s proprietary **Eagle-grade steel**, the cassette s sprockets are precision-machined to minimize chain stretch and maximize durability, even under the most demanding conditions. The **12-speed design** leverages SRAM s advanced **HyperGlide ** technology, which features optimized tooth profiles and tighter tolerances to reduce shifting lag, improve efficiency, and extend both the cassette and chain s lifespan. This system also supports SRAM s **eTap AXS** electronic shifting, allowing for ultra-responsive, precise control via a remote or smartphone app, though it remains fully compatible with mechanical shifting setups as well. The **compact 10T smallest sprocket** is particularly noteworthy, as it enables riders to maintain higher cadences on steep climbs without sacrificing power, while the **50T largest cog** ensures a strong, low-effort gear for descending or long-distance riding.

Beyond performance, the **XD driver** adds a layer of practicality, offering a secure, non-slip fit that prevents cassette rotation during intense pedaling or rough terrain. This feature is especially beneficial for riders who frequently switch between different cassettes or use a chain guide, as it eliminates the need for additional spacers or adapters. The **12-speed Eagle system** as a whole is engineered to work seamlessly with SRAM s **XX1 or NX Eagle drivetrains**, providing riders with a lightweight yet robust setup that can handle everything from cross-country endurance rides to extreme downhill racing. Whether paired with a lightweight carbon frame or a rugged hardtail, this cassette ensures that every pedal stroke is efficient, every shift is smooth, and every ride is optimized for the demands of modern mountain biking.

The SRAM Eagle 12-speed MTB cassette (part number 277813014, 50/10T with XD-Driver 50) is a high-performance drivetrain component designed for modern mountain biking. Below is a detailed breakdown of its pros and cons, followed by a conclusion and recommendation.

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### **Pros**

1. **Wide Gear Range and Versatility**

The 50/10T cassette provides an exceptionally broad gear range, with a total spread of 5:1 (50T largest cog to 10T smallest). This is ideal for aggressive downhill riding, technical climbs, and all-mountain conditions where extreme terrain variability is common. The wide range reduces the need for frequent shifting and allows for efficient pedaling across steep descents and climbs.

2. **12-Speed Technology**

SRAM s Eagle system offers 12 speeds, which provides finer gear increments compared to traditional 10- or 11-speed setups. This allows for more precise gear selection, reducing the need for large jumps between gears. It s particularly useful for riders who demand smooth, efficient shifting in varied conditions.

3. **Durability and Reliability**

SRAM s Eagle components are built to withstand the rigors of mountain biking, including heavy loads, mud, and debris. The cassette is made from high-quality materials and is designed to handle the stress of aggressive riding. The XD-Driver 50 is also robust, ensuring secure mounting and longevity.

4. **Compatibility with Modern SRAM Drivetrains**

This cassette is designed to work seamlessly with SRAM s NX, XX, and XX1 Eagle drivetrains, as well as other compatible components like the GX Eagle. If you re already using a SRAM system, this cassette will integrate smoothly without compatibility issues.

5. **Performance Benefits**

The wide range and fine spacing of gears can improve pedaling efficiency, especially in technical or extreme conditions. Riders who frequently tackle steep climbs or fast descents will appreciate the ability to find the optimal gear without skipping too many ratios.

6. **Future-Proofing**

SRAM continues to develop its Eagle system, and this cassette is part of a platform that may receive updates or improvements. While not all components are backward-compatible, the 12-speed system is likely to remain relevant for several years.

7. **Lightweight Design**

Compared to older cassettes with fewer gears, the Eagle cassette is relatively lightweight, which can contribute to a more agile bike feel. The reduction in weight is modest but can be noticeable in high-performance setups.

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### **Cons**

1. **Cost**

The SRAM Eagle 12-speed cassette is significantly more expensive than traditional 10- or 11-speed cassettes. For example, a comparable 10-speed cassette might cost half as much or less. This higher cost may not be justified for riders who don t frequently use the extreme gearing or who prefer a simpler setup.

2. **Complexity and Maintenance**

The 12-speed system introduces additional complexity, including more chains, derailleurs, and shifting mechanisms. This can lead to higher maintenance requirements, such as more frequent chain cleaning, derailleur adjustments, and potential issues with chain wear or derailleur alignment. Riders who prefer low-maintenance setups may find this a drawback.

3. **Chain Wear and Cost of Replacement**

The Eagle system uses a narrower chain (0.675-inch) compared to traditional chains (0.75-inch or 0.8-inch). While this reduces weight, it also means the chain wears out faster and is more expensive to replace. A 12-speed chain is pricier than a standard chain, and frequent replacements can add up over time.

4. **Limited Use Cases for Extreme Gearing**

While the 50/10T range is excellent for downhill and aggressive riding, it may be overkill for casual or cross-country riders who don t need such extreme gearing. In these cases, a narrower range (e.g., 34/11T) would be more practical and cost-effective.

5. **Compatibility Issues with Non-SRAM Components**

If you re mixing and matching components from different brands (e.g., Shimano derailleurs with SRAM cassettes), you may encounter compatibility issues or reduced performance. SRAM s Eagle system is optimized for its own components, and using third-party parts can lead to shifting problems or premature wear.

6. **Learning Curve**

The fine spacing of gears in a 12-speed system requires riders to develop a feel for precise shifting. New riders or those accustomed to traditional setups may struggle with the nuances of shifting in a 12-speed system, potentially leading to missed shifts or inefficient gear selection.

7. **Weight of the Entire Drivetrain**

While the cassette itself is lightweight, the overall Eagle drivetrain (including derailleurs, chain, and cranks) is heavier than a comparable 10-speed setup. This added weight may not be noticeable on most bikes but could be a consideration for riders prioritizing minimal weight.

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### **Conclusion**

The SRAM Eagle 12-speed cassette with a 50/10T range is a powerful and versatile tool for mountain bikers who demand extreme gearing and fine-tuned performance. It excels in aggressive riding conditions, offering unmatched versatility and efficiency. However, the higher cost, increased maintenance requirements, and complexity may not be justified for all riders. It is particularly well-suited for downhill, all-mountain, and freeride riders who frequently tackle steep climbs and fast descents. For casual riders or those who prioritize simplicity and cost-effectiveness, a narrower-range cassette or a traditional 10- or 11-speed setup might be a better choice.

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### **Recommendation**

- You ride in extreme conditions that require a wide gear range (e.g., downhill, aggressive all-mountain, or freeride).

- You are already using or plan to use a compatible SRAM Eagle drivetrain (e.g., NX, XX, or XX1).

- You value precise gear selection and smooth shifting in varied terrain.

- You are willing to invest in a high-performance system and are prepared for the associated maintenance and cost.

- You primarily ride cross-country or flat terrain where extreme gearing is unnecessary.

- You prefer a simpler, lower-maintenance drivetrain and are willing to compromise on gear range.

- Budget is a significant concern, as the cost of the cassette and associated components (chain, derailleurs) will be higher than traditional setups.

- You are new to mountain biking or prefer a more straightforward shifting experience.

- For riders who want a balance between performance and cost, a 10-speed cassette with a slightly narrower range (e.g., 34/11T) could be a practical alternative.

- If you re using a Shimano drivetrain, consider a Shimano Deore or SLX 12-speed cassette for better compatibility and potentially lower cost.

- For downhill-specific riding, a dedicated DH cassette (e.g., SRAM NX DH or Shimano Deore DH) with a wider range (e.g., 48/10T) might be more appropriate.

Ultimately, the SRAM Eagle 50/10T cassette is a top-tier choice for riders who push the limits of their bikes, but it s not the best fit for everyone. Carefully evaluate your riding style, budget, and long-term goals before making a decision.

Details:

Rainbow color x1 cassette SRAM XG 1299 12 speed 10-50T, low mileage.

part #: 277813014 prices

• $169.90-$185.00

specifications ribicycl:

• brand: Sram
• mpn: 277813014
• part type: Cassette Driver
• compatible brand: For Sram
• color: Multicolor, Black
• compatible model: Eagle
• material: Steel
• set includes: Cassette/freewheel
• smallest sprocket: 10 Tooth
• number of speeds: 12 Speed
• freehub/driver type: Sram Xd
• largest sprocket: 50 Tooth
• compatible bike type: Mountain Bike

shipping ribicycl:

• class: Standard
• transit: 4-10 Days
• service: USPS Ground Advantage
• carrier: USPS
• cost: $0.00
• type: Calculated

general ribicycl:

• Cycling > Bicycle Components Parts > Cassettes, Freewheels Cogs
• condition: Used

returns ribicycl:

• time: 30 Days
• method: Money back
• policy: Returns Accepted
• paid by: Buyer

seller ribicycl:

• # reviews: 285
• rating: 100.0%
• city: Macon, Georgia

payments ribicycl:

• other
• wallet: Apple-pay
• credit card: Mastercard

offer ribicycl:

• started: April 28, 2026
• sold: 0
• options: Ship-to-home
• best offers: True
• availability: In Stock
• quantity: 1

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