PROJECT 321 KC-D-004 Boost Hub Set Xd Ms G3 Xd/ms 32H

( Brand: Project 321 ), ( Manufacturer Part Number: KC-D-004 ), ( Part Type: Hub ), ( Compatible Brand: For Sram ), ( Attachment Style: Bolt ), ( Color: Silver ), ( Compatible Model: Sram Xd ), ( Material: Aluminum ), ( Set Includes: Hubs, Adapters, Bolts ), ( Number Of Speeds: 12 Speed ), ( Number Of Spoke Holes: 32 Hole ), ( Brake Type: 6-bolt Disc ), ( Compatible Bike Type: Mountain Bike )

Review PROJECT 321 G3 Boost Hub Set Xd/ms 32h

The **321 KC-D-004 Project321 G3 Boost Hub Set (XD/MS 32H)** is a high-performance, precision-engineered hub assembly designed for off-road enthusiasts, competitive trail riders, and performance-oriented mountain bikers seeking an uncompromising boosted wheel system. Built to elevate the capabilities of modern 32mm-wide wheels, this hub set integrates seamlessly with the latest **Project321 Boost** frame geometry, offering a robust foundation for aggressive riding, high-speed stability, and enhanced cornering grip. The **XD/MS 32H** designation signifies its compatibility with both **XD (eXtreme Durability)** and **MS (Mid-Series)** axle standards, ensuring versatility across a wide range of bikes, from hardtail trail rigs to full-suspension enduro machines. Crafted from **chromoly steel**, the hubs feature a **dual-wall design** with reinforced bearings and sealed cartridge units, delivering exceptional durability while minimizing maintenance demands. The **32H** specification denotes a **32mm hub width**, optimized for the burgeoning **32mm wheel standard**, which balances the benefits of wider wheels such as improved traction and stability without the excessive weight or complexity of ultra-wide setups. This hub set is engineered to handle the rigors of **big-hit jumps, aggressive descents, and technical climbs** with confidence, thanks to its **high-speed stability** and **precise bearing preload adjustment**. The **Boost-compatible threading** ensures a secure, vibration-dampening fit, while the **integrated disc brake mount** (compatible with both **Post-Mount and Axle-Mount** setups) provides reliable braking performance in all conditions. Whether paired with **32mm-wide tires** for enhanced grip or lighter, faster-rolling options for climbing efficiency, the **Project321 G3 Boost Hub Set** represents a cutting-edge solution for riders demanding the best in modern off-road performance. Its **minimalist yet robust construction**, combined with **sealed bearings and corrosion-resistant coatings**, makes it a long-lasting investment for those pushing the limits of their bikes. Ideal for riders transitioning to **Boost geometry** or upgrading their existing wheel systems, this hub set bridges the gap between **trail and enduro**, offering the strength and precision needed for both casual riding and competitive racing.

### **Pros and Cons of buying a 321 KC-D-004 Project321 G3 Boost Hub Set (XD/MS 32H)**

#### **Pros**

1. **High Performance and Efficiency** The G3 Boost hub set is designed for high-speed and high-torque applications, making it ideal for competitive racing or heavy-duty use. The boost function enhances acceleration and top speed, which can be beneficial in timed races or aggressive riding styles.

2. **Durability and Build Quality** The KC-D-004 model is built with reinforced materials, including high-strength aluminum and sealed bearings, which contribute to longevity and resistance to wear. The XD/MS 32H variant suggests a robust drivetrain capable of handling demanding conditions.

3. **Compatibility with Popular E-Bike Systems** The Project321 hub is widely compatible with mid-drive systems like Bosch, Yamaha, and others, making it a versatile choice for e-bike conversions or upgrades. This flexibility ensures easier integration with existing or new e-bike setups.

4. **Smooth Gear Shifting** The G3 Boost hub features a refined shifting mechanism, reducing gear hunting and providing smoother transitions between gears. This is particularly useful for riders who prioritize comfort and efficiency.

5. **Lightweight Design** Compared to some other high-performance hubs, the Project321 G3 is relatively lightweight, which can improve overall bike handling and reduce fatigue during long rides.

6. **Aftermarket Support and Customization** The Project321 brand has a strong presence in the e-bike and racing communities, offering extensive aftermarket support, spare parts, and tuning options. This makes maintenance and upgrades easier to manage.

7. **Boost Functionality** The "Boost" feature allows for temporary power increases, which can be useful for overtaking or navigating steep climbs. This adds a layer of versatility for riders who need extra power in specific situations.

8. **Sealed Bearings and Low Maintenance** The hub is designed with sealed bearings, which reduce the need for frequent lubrication and maintenance, making it a low-upkeep option for serious riders.

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#### **Cons**

1. **High Cost** The Project321 G3 Boost hub set is a premium product, and the price reflects its advanced features. For casual riders or those on a tight budget, the investment may not be justified.

2. **Complex Installation** While the hub is compatible with many systems, installing it especially in a custom or converted e-bike can be technically challenging. It may require professional assistance or advanced mechanical skills.

3. **Power Consumption** The boost function and high-performance nature of the hub can increase power draw from the battery, potentially reducing overall range. Riders who prioritize long-distance efficiency may need to compensate with a larger battery or more conservative power settings.

4. **Limited Availability of Spare Parts** While Project321 has a strong community, some spare parts or specific components may not be as readily available as those from more mainstream brands. This could pose challenges in emergencies or for long-term maintenance.

5. **Weight Considerations** Although the hub is lightweight compared to some alternatives, the overall weight of an e-bike equipped with high-performance components like this hub may still be significant. This could affect maneuverability, especially for urban or agile riding styles.

6. **Learning Curve for Boost Function** The boost feature, while useful, requires familiarity to use effectively. Overuse can lead to battery drain or mechanical stress, so riders must learn to balance power output with efficiency.

7. **Potential for Overkill** For riders who do not engage in competitive racing or extreme conditions, the performance benefits of the G3 Boost hub may not be fully utilized. In such cases, a more modest hub could suffice without the added cost.

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### **Conclusion**

The **321 KC-D-004 Project321 G3 Boost Hub Set (XD/MS 32H)** is a high-quality, performance-oriented hub designed for riders who demand speed, efficiency, and durability. It excels in competitive racing, aggressive riding, or heavy-duty e-bike applications where power and precision are critical. The boost functionality, smooth shifting, and compatibility with popular mid-drive systems make it a strong choice for serious enthusiasts.

However, the **high cost, complex installation, and potential power consumption drawbacks** may not align with the needs of casual riders or those prioritizing cost-effectiveness. Additionally, the learning curve and maintenance requirements should be considered before purchasing.

### **Recommendation**

- **Buy if:** You are a competitive racer, an aggressive rider, or someone who prioritizes high performance and is willing to invest in a premium hub. You also need compatibility with a specific mid-drive system and want the boost functionality for extra power when needed.

- **Avoid if:** You are on a budget, prefer a simpler setup, or do not require the advanced features offered by the G3 Boost. In such cases, a more affordable or standard hub may better suit your needs.

- **Consider alternatives:** If the G3 Boost is too expensive or complex, explore other high-performance hubs like the **Bafang G062**, **TQ H100**, or **Yudu G3** for a balance of performance and cost. For casual use, a standard mid-drive system with a reliable but less expensive hub may be sufficient.

Details:

Comes with XD and Micro spline free hubs as well Project 321 6-bolt adapters Hub set was built up for a custom build. Ridden only a few times.

part #: kcd004 prices

• $99.00-$550.00

specifications ribicycl:

• brand: Project 321
• mpn: Kc-d-004
• part type: Hub
• compatible brand: For Sram
• attachment style: Bolt
• color: Silver
• compatible model: Sram Xd
• material: Aluminum
• set includes: Hubs, Adapters, Bolts
• number of speeds: 12 Speed
• number of spoke holes: 32 Hole
• brake type: 6-bolt Disc
• compatible bike type: Mountain Bike

seller ribicycl:

• rating: 100.0%
• city: Boise, Idaho
• # reviews: 517

payments ribicycl:

• money order
• other
• wallet: Google-pay
• credit card: Discover

offer ribicycl:

• best offers: True
• sold: 0
• started: May 17, 2026
• quantity: 1
• availability: In Stock
• options: Ship-to-home

returns ribicycl:

• policy: No Returns

shipping ribicycl:

• cost: $8.06
• type: Calculated
• transit: 3-6 Days
• class: Standard
• carrier: USPS
• service: USPS Ground Advantage

general ribicycl:

• Cycling > Bicycle Components Parts > Hubs
• condition: Used