SINGLEWORKS Bicycle Cassette Cog Crmo 842802070979 3/32 21T

( Brand: Singleworks ), ( Part Type: Bicycle Cassette ), ( Color: Silver ), ( Item Height: 3/32 ), ( Largest Sprocket: 21 Tooth ), ( Set Includes: Cassette Cog ), ( Material: Steel ), ( Number Of Speeds: 1 Speed ), ( UPC: 842802070979 )

Review SINGLEWORKS Bicycle Cassette Cog 3/32 Inch 21t Crmo

The **Singleworks 842802070979 21-Speed Bicycle Cassette Cog (3/32" x 21T, CRMO)** is a precision-engineered, high-performance drivetrain component designed to elevate the efficiency, durability, and shifting performance of modern bicycles. Crafted from **chromoly steel (CRMO)**, this cassette cog embodies a perfect blend of strength and weight savings, making it an ideal choice for cyclists seeking both reliability and a lighter ride. The **3/32-inch spline width** ensures compatibility with a wide range of Shimano, SRAM, and other standard 3/32-inch drivetrains, while the **21-tooth profile** delivers a balanced gear ratio, offering smooth acceleration and efficient climbing without sacrificing top-end speed. Engineered with Singleworks signature attention to detail, this cog features a **tapered hub interface** that minimizes wobble and maximizes power transfer, reducing chain slap and improving overall drivetrain longevity. The **laser-cut teeth** provide consistent meshing with the chain, reducing wear and ensuring smoother, more predictable shifting whether you're tackling steep climbs or cruising on flat terrain. Built to withstand the demands of aggressive riding, this cassette cog is **hardened and polished** to resist corrosion and wear, making it a durable upgrade for both road and gravel cyclists. Whether you're a performance-oriented rider upgrading your drivetrain or a mechanic looking for a reliable replacement part, the Singleworks 21T CRMO cog delivers a seamless, high-quality solution that enhances both performance and ride feel.

**Pros and Cons of buying a Singleworks 842802070979 Bicycle Cassette (3/32" Bolt Pattern, 21T, CRMO)**

### **Pros**

1. **High-Quality Materials** The cassette is made from **CRMO (Chrome-Molybdenum Steel)**, which offers a strong yet lightweight construction. This material is durable and resistant to wear, making it suitable for both casual and competitive riding.

2. **Precision Engineering** Singleworks is known for its **high-precision manufacturing**, ensuring smooth shifting and consistent performance. The cog spacing and alignment are optimized for reliable engagement with the chain.

3. **Durability** The **21-tooth largest cog** (chainring) is designed to handle moderate to high loads without bending or stretching prematurely. This makes it a good choice for riders who prioritize longevity in their drivetrain components.

4. **Compatibility** The **3/32" bolt pattern** is standard for most modern road and gravel bikes, making it easy to install without requiring special adapters. It fits well with common chainrings and derailleurs.

5. **Cost-Effective Upgrade** Compared to some premium brands, this cassette offers a **good balance of performance and affordability**, making it a practical choice for riders looking to improve their drivetrain without a significant investment.

6. **Reliable Shifting** The cassette is designed to work smoothly with **standard 10- or 11-speed derailleurs**, reducing the risk of chain drops or skipping under normal riding conditions.

7. **Easy Installation** The **freehub body compatibility** (assuming it matches your bike s freehub) means it can be installed with basic tools, though some riders may prefer professional help for optimal alignment.

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### **Cons**

1. **Not for Extreme Loads** While durable, the **CRMO construction is not as hard as some premium steel or carbon alternatives**. Heavy riders or those riding in very rough terrain may experience **faster wear** compared to higher-end cassettes.

2. **Limited Range** A **single 21T cog** means this is not a **full cassette** (which typically includes multiple cogs for different gears). It is designed to be used with a **single chainring setup** (e.g., 1x drivetrains). If you need multiple gears, you ll need additional chainrings or a full cassette.

3. **Potential for Chain Wear** If paired with a **low-quality chain**, the cassette may wear out faster due to improper lubrication or misalignment. A **high-quality chain (e.g., Shimano DN-S3050 or SRAM PowerLink)** is recommended for longevity.

4. **No Brand-Specific Advantages** Unlike **Shimano, SRAM, or Campagnolo**, Singleworks is not a widely recognized name in the cycling industry. While this doesn t necessarily mean poor quality, it may lack **after-sales support, warranty coverage, or specialized tuning** available from major brands.

5. **Limited Availability of Spare Parts** If the cassette fails, finding **replacement cogs or a full cassette** from Singleworks may be harder than with mainstream brands, which have extensive aftermarket support.

6. **Potential for Misalignment** If not installed **perfectly**, the cassette may cause **chain noise or skipping**. Unlike some high-end cassettes with self-aligning features, this one requires **precise installation** to perform optimally.

7. **Not Ideal for Aggressive Riding** While durable, it is **not designed for extreme off-road use, track racing, or heavy-duty commuting** where higher-end cassettes (e.g., with hardened teeth) would be preferable.

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### **Conclusion**

The **Singleworks 842802070979 21T CRMO cassette** is a **solid, budget-friendly option** for riders using a **single-chainring setup** who want a **durable, smooth-shifting cog**. It excels in **durability, compatibility, and ease of installation**, making it a practical choice for **road, gravel, or casual cyclists** who don t need the highest performance or extreme longevity.

However, it is **not a full cassette** (missing multiple gears), and its **CRMO construction may not match the wear resistance of premium steel or carbon alternatives**. It is best suited for **moderate-use riders** who prioritize **cost-effectiveness and reliability** over cutting-edge performance.

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### **Recommendation**

- You have a **1x drivetrain** and need a **single large cog** (21T).

- You want a **durable, no-frills cassette** for **road or gravel riding**.

- You re on a **tight budget** but still want a **better-than-basic** cog.

- You plan to **pair it with a high-quality chain** (e.g., Shimano DN or SRAM PowerLink) to maximize longevity.

- You need **multiple gears** (a full cassette is required).

- You ride **heavily in rough terrain** or carry **very high loads** (consider a **hardened-steel or carbon cassette**).

- You prefer **brand-name support** (Shimano, SRAM, Campagnolo) for warranty or parts availability.

- You re looking for **ultra-lightweight or ultra-high-performance** components.

**Final Verdict:** This cassette is a **good mid-range option** for **1x setups** where cost and durability are priorities. For **full cassettes or extreme conditions**, higher-end brands may be worth the investment.

Details:

Singleworks Chorally single speed cog for a cassette. 3/32 - 21 tooth. Pre-owned in excellent condition.

specifications ribicycl:

• brand: Singleworks
• part type: Bicycle Cassette
• color: Silver
• item height: 3/32
• largest sprocket: 21 Tooth
• set includes: Cassette Cog
• material: Steel
• number of speeds: 1 Speed
• upc: 842802070979

offer ribicycl:

• sold: 0
• availability: In Stock
• options: Ship-to-home
• quantity: 1
• started: May 15, 2026

general ribicycl:

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

shipping ribicycl:

• carrier: USPS
• cost: $6.07
• transit: 5-12 Days
• type: Calculated
• class: Standard
• service: USPS Ground Advantage

returns ribicycl:

• policy: No Returns

payments ribicycl:

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

seller ribicycl:

• city: North Charleston, South Carolina
• rating: 100.0%
• # reviews: 2111

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