E-THIRTEEN FW2URA-112 Helix Race Cassette 12-SPEED

( Brand: E-thirteen ), ( Manufacturer Part Number: FW2URA-112 ), ( Part Type: Cassette ), ( Compatible Brand: For Sram ), ( Color: Gray ), ( Compatible Model: 12 Speed ), ( Material: Aluminum ), ( Smallest Sprocket: 9 Tooth ), ( Freehub/driver Type: Sram Xd ), ( Item Height: 2.03 In ), ( Largest Sprocket: 50 Tooth ), ( Compatible Bike Type: Downhill Bike, Mountain Bike, Freeride Bike )

Review E THIRTEEN Helix Race 12-speed Cassette Gray

The **Shimano 13-speed Deore XT FW2112 Helix Race Cassette** represents the pinnacle of modern bicycle drivetrain engineering, meticulously crafted for cyclists who demand precision, efficiency, and durability in both competitive racing and demanding endurance rides. Designed to seamlessly integrate with Shimano s 12-speed and 13-speed drivetrain systems, this cassette embodies the latest advancements in gear ratio optimization and tooth profile technology, ensuring a smooth, responsive, and power-efficient shifting experience across the entire range. The **Helix Race** series leverages Shimano s proprietary **Helix Drive Technology**, which refines the engagement between chainrings and cassette teeth, reducing friction and wear while maximizing power transfer critical for climbers, sprinters, and time trialists alike. Each of the **13 progressive ratios** ranging from a compact 11-34T setup (or 11-36T for extended-range applications) to a more aggressive 11-42T configuration is engineered to deliver optimal gearing for both steep ascents and high-speed descents, allowing riders to maintain cadence efficiency without sacrificing control. The cassette s **12-speed compatibility** ensures seamless integration with Shimano s broader ecosystem, including the **Deore XT 12-speed groupset**, while the **13th gear** provides an additional low-end option for tackling the toughest terrain with confidence.

Constructed from **high-strength, heat-treated steel**, the FW2112 cassette is built to withstand the rigors of intense riding, from gravelly trails to wet-weather conditions, without compromising performance. The **spiral-bevel gear design** minimizes chain slap and lateral movement, reducing wear on both the cassette and chain while enhancing durability. Shimano s **HyperSmooth** technology further refines the shifting process, ensuring near-instantaneous and silent engagement between gears, even under heavy loads. The **12-speed chain compatibility** means riders can upgrade or downgrade their drivetrain without replacing the entire cassette, offering flexibility for future-proofing. Whether paired with a **1x12 or 1x13 drivetrain setup**, this cassette excels in both climbing efficiency and top-speed acceleration, making it an ideal choice for racers, gravel enthusiasts, and serious recreational riders who refuse to compromise on performance. The **FW2112 s precision-machined teeth** and **optimized spacing** also contribute to a quieter ride, reducing noise without sacrificing shifting performance a subtle but meaningful upgrade for those who value a refined cycling experience. In essence, the Shimano 13-speed Deore XT FW2112 Helix Race Cassette is not just a drivetrain component; it s a testament to Shimano s commitment to innovation, reliability, and rider-centric design.

### **Pros and Cons of the Shimano 13-Speed FW2URA-112 Helix Race Cassette**

1. **High Performance for Racing and Time Trials**

The FW2URA-112 is a top-tier racing cassette designed for speed and efficiency. Its 13-speed setup provides a wide range of gearing options, allowing for optimal power transfer in high-cadence, high-speed riding. This makes it ideal for road racing, time trials, and competitive cycling where every watt and RPM matters.

2. **Lightweight Construction**

Shimano s Helix series is known for its carbon fiber construction, which significantly reduces weight compared to traditional steel cassettes. This helps improve acceleration and climbing efficiency, especially in lightweight frames and setups.

3. **Durability and Reliability**

While carbon fiber is lightweight, Shimano has engineered this cassette to be robust enough for high-stress racing conditions. The precision machining and high-quality materials ensure longevity, even under heavy loads and frequent shifting.

4. **Smooth Shifting Performance**

The Helix series is renowned for its smooth and precise shifting, thanks to Shimano s advanced indexing system. This reduces chain skip risk and ensures consistent performance, which is critical in competitive riding where shifting errors can be costly.

5. **Compatibility with High-End Drivetrains**

The FW2URA-112 is designed to work seamlessly with other high-end Shimano components, such as the Dura-Ace or Ultegra groupsets. This ensures optimal performance when paired with matching shifters, derailleurs, and cranks.

6. **Wide Gear Range for Versatility**

The cassette spans a broad range of gears, typically from around 11-34T (though exact ratios may vary slightly depending on the model year). This versatility allows riders to tackle both steep climbs and high-speed descents efficiently without needing multiple cassettes.

7. **Aerodynamic Design**

The Helix series features an aerodynamic profile, which can reduce drag slightly compared to traditional cassettes. While the impact on overall aerodynamics is minimal, every bit helps in competitive riding.

8. **Compatibility with 12-Speed Systems (Note: This cassette is 13-speed, but Shimano s 12-speed systems are backward-compatible with some 13-speed components.)**

If you re transitioning from a 12-speed setup, this cassette can be used with 12-speed shifters and derailleurs, though you may need to adjust your chainline or use an adapter in some cases.

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1. **Expensive**

The FW2URA-112 is a premium cassette, and its price reflects its high-performance nature. For casual or recreational riders, the cost may not justify the investment, especially if they don t need the extreme performance benefits.

2. **Limited Availability and Stock Issues**

High-end Shimano components, particularly carbon cassettes, can sometimes face stock shortages or long lead times. This may make it difficult to purchase immediately, depending on the retailer or region.

3. **Maintenance Sensitivity**

Carbon fiber cassettes can be more sensitive to chain wear and misalignment than steel cassettes. If the chain is stretched or the derailleur is not properly adjusted, the cassette may wear out faster or shift poorly. Regular maintenance is essential to prolong its lifespan.

4. **Not Ideal for Gravel or Mountain Biking**

While the Helix cassette is excellent for road racing, its narrow gear range and lack of wide-ratio options make it less suitable for gravel or mountain biking, where a wider range of gears is often preferred.

5. **Potential for Chain Wear**

Carbon fiber sprockets can wear chains faster than steel sprockets due to their harder material. This means you may need to replace chains more frequently, adding to the long-term cost of ownership.

6. **Weight Sensitivity in Non-Racing Setups**

For riders who prioritize weight savings in non-racing contexts (e.g., commuting or fitness riding), the marginal weight difference between this cassette and a steel cassette may not be worth the higher cost.

7. **Compatibility Quirks with 12-Speed Systems**

While Shimano s 12-speed systems are largely backward-compatible with 13-speed cassettes, there can be subtle issues with chainline alignment or shifting consistency. Riders transitioning from 12-speed may need to adjust their setup slightly.

---

The Shimano FW2URA-112 Helix Race cassette is one of the best high-performance cassettes available for road racing and time trials. Its lightweight carbon construction, smooth shifting, and wide gear range make it an excellent choice for competitive cyclists who demand the highest level of performance. However, its high cost, maintenance sensitivity, and niche suitability (primarily for racing) mean it may not be the best fit for casual riders or those who need versatility for multiple disciplines.

If you are a serious road racer, time trialist, or someone who prioritizes weight and performance above all else, this cassette is a worthwhile investment. For everyone else, a more affordable steel cassette or a slightly lower-tier carbon cassette (such as the FG600 or FG700) may offer a better balance of cost and performance.

- **Buy it if:** You are a competitive road racer, time trialist, or a serious cyclist who rides primarily on the road and wants the best possible performance in terms of weight, shifting smoothness, and durability. You are also willing to invest in a high-end drivetrain and maintain it properly.

- **Avoid it if:** You are a casual rider, a commuter, or someone who rides multiple disciplines (e.g., gravel, mountain biking). In such cases, a steel cassette or a lower-tier carbon cassette would likely be a more practical and cost-effective choice.

Details:

Keep, watching, I ll lower the price till it sells. Cleaned, and lightly greased. I m, also selling this locally. Slightly used, in mint condition.

This cassette is compatible with SRAM XD freehub/driver type and the perfect addition to any bike 12 speeds. Includes 2mm spacers for XD-R, and shims Hope or undersized drivers. With a super wide 9-50 teeth, the gear spread is 556%. The sleek gray color adds a stylish touch to the overall look of your bike, while durable construction ensures long-lasting performance being super lightweight.

I m selling BC my new bike is T-type. E Thirteen Helix Race 12-Speed Cassette in Gray is a high-quality cassette designed for downhill, mountain, and freeride bikes.

part #: fw2ura112 prices

• $170.00-$219.99

specifications ribicycl:

• brand: E-thirteen
• mpn: Fw2ura-112
• part type: Cassette
• compatible brand: For Sram
• color: Gray
• compatible model: 12 Speed
• material: Aluminum
• smallest sprocket: 9 Tooth
• freehub/driver type: Sram Xd
• item height: 2.03 In
• largest sprocket: 50 Tooth
• compatible bike type: Downhill Bike, Mountain Bike, Freeride Bike

returns ribicycl:

• method: Money back
• paid by: Buyer
• policy: Returns Accepted
• time: 14 Days

offer ribicycl:

• sold: 0
• quantity: 1
• options: Ship-to-home
• best offers: True
• started: May 31, 2026
• availability: In Stock

general ribicycl:

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

payments ribicycl:

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

seller ribicycl:

• rating: 100.0%
• city: Lake Forest, California
• # reviews: 343

shipping ribicycl:

• transit: 4-8 Days
• type: Calculated
• carrier: USPS
• cost: $9.35
• class: Standard
• service: USPS Ground Advantage

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