MOMENTUM HB591 Grease Guard Front Hub Wilderness Trail 28H 100MM

( Brand: Momentum ), ( Manufacturer Part Number: HB591 ), ( Part Type: Grease Guard Hub Bike ), ( Number Of Spoke Holes: 28 Hole ), ( Attachment Style: Quick Release ), ( Brake Type: Front ), ( Color: Silver ), ( Compatible Bike Type: Mountain Bike ), ( Material: Aluminum ), ( Set Includes: Hubs )

Review MOMENTUM Wtb Grease Guard Front Hub 28h 100mm Wilderness Trail Bikes Vintage

The **WTB HB591 Grease Guard Momentum Front Hub** is a premium, high-performance front hub designed specifically for demanding off-road and trail riding, offering an unparalleled blend of durability, efficiency, and reliability. Built with WTB s signature engineering precision, this hub features a **100mm-wide Momentum axle system**, a cutting-edge design that maximizes wheel strength while minimizing weight a critical advantage for riders tackling rugged terrain where stability and responsiveness are paramount. The **28-hole pattern** ensures compatibility with a wide range of modern rim and tire setups, from aggressive knobby off-road tires to versatile all-terrain options, making it a versatile choice for adventurers seeking versatility without compromise. At the heart of this hub lies the **Grease Guard technology**, a proprietary sealing system that locks in lubrication while keeping contaminants out, significantly extending the lifespan of bearings and reducing maintenance demands. This innovation is particularly beneficial in environments where mud, dust, and debris are constant challenges, ensuring smoother operation and fewer interruptions during long rides. The hub s **momentum-optimized design** enhances power transfer and reduces rotational resistance, allowing for quicker acceleration and better handling on steep climbs or technical descents. Whether navigating rocky singletracks, loose sand, or slippery trails, the HB591 delivers consistent performance with minimal effort, making it an ideal choice for serious riders who demand nothing less than excellence. Built to withstand the harshest conditions, this hub is constructed from high-grade materials and features robust seals and bearings that endure repeated impacts and heavy loads, ensuring longevity even under extreme use. The **adjustable cone system** allows for precise bearing preload tuning, enabling riders to fine-tune performance for their specific riding style or terrain, whether prioritizing speed, comfort, or durability. Perfect for **wilderness and trail-focused applications**, the WTB HB591 Grease Guard Momentum Front Hub is a testament to WTB s commitment to innovation and performance, offering riders the confidence to tackle any adventure with ease.

The **WTB HB591 Grease Guard Momentum Front Hub (28H, 100mm, Wilderness Trail)** is a high-end front hub designed for enduro and downhill mountain biking. Below is a detailed breakdown of its pros and cons, followed by a conclusion and recommendation.

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### **Pros**

1. **Superior Durability and Strength**

The HB591 is built with a **high-strength aluminum alloy** and features a **grease guard system**, which protects the bearings from dirt, mud, and debris. This significantly extends the hub s lifespan, especially in harsh trail conditions. The **100mm axle width** provides stability and rigidity, reducing flex under heavy loads.

2. **Grease Guard Technology**

WTB s proprietary **Grease Guard** system seals the bearings more effectively than traditional shields, preventing mud and water ingress. This reduces maintenance needs and improves reliability in wet or muddy conditions. The **Momentum** variant further enhances this protection with optimized sealing.

3. **Lightweight Design**

Despite its robustness, the hub remains relatively lightweight compared to other high-end enduro/downhill hubs. This contributes to better wheel responsiveness and handling, which is crucial for aggressive riding.

4. **High-Quality Bearings and Sealing**

The hub uses **premium bearings** (often sealed or grease-packed) that are designed to handle high speeds and heavy loads. The **dual-shielded bearings** in the Grease Guard version provide extra protection against contaminants.

5. **Compatibility with Wide Tires**

The **28H (28mm internal width)** is ideal for modern **2.3" to 2.6" wide tires**, which are common in enduro and downhill bikes. This allows for better traction, comfort, and stability on rough terrain.

6. **WTB s Reputation for Reliability**

WTB is a trusted brand in the mountain biking industry, known for producing durable, high-performance components. The HB591 has been widely adopted by professional riders and teams, indicating its reliability in extreme conditions.

7. **Easy Maintenance (Compared to Open Hubs)**

While not completely maintenance-free, the Grease Guard system reduces the frequency of cleaning and regreasing compared to traditional hubs. This is a significant advantage for riders who frequently ride in muddy or dirty conditions.

8. **Smooth Rolling Performance**

The hub s design minimizes vibration and flex, leading to a **smoother ride** and better energy transfer from the pedals to the wheels. This is particularly noticeable on rough descents.

9. **Wide Axle Compatibility**

The **100mm axle width** is standard for modern enduro and downhill bikes, ensuring compatibility with most frames and forks designed for aggressive riding. This makes it a versatile choice for riders upgrading their setup.

10. **Resale Value**

WTB components, especially high-end ones like the HB591, retain their value well. If you decide to upgrade later, you can often sell it at a reasonable price.

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### **Cons**

1. **High Cost**

The HB591 is **not a budget-friendly** hub. Priced in the **$300 $400 range** (depending on retailer and discounts), it is significantly more expensive than entry-level or mid-range alternatives. This may be a barrier for riders on a tight budget.

2. **Overkill for Light Use**

If you primarily ride **trail or cross-country**, a more affordable hub (e.g., a **Shimano Deore or SRAM GX hub**) may suffice. The HB591 s extreme durability and sealing are best utilized in **heavy-duty enduro or downhill riding**, where it justifies the cost.

3. **Weight Compared to Carbon Hubs**

While the HB591 is lightweight for an aluminum hub, it is **heavier than carbon fiber hubs** (e.g., **DT Swiss XM15, Race Face Turbine**). If weight savings are a priority, a carbon hub may be preferable, though at a higher cost.

4. **Limited Customization**

The hub comes in a **fixed set of sizes and axle standards** (100mm, 28H). If you need a different axle width (e.g., 120mm for some enduro frames) or internal width, you ll need to look elsewhere.

5. **Potential for Over-Greasing**

While the Grease Guard system is excellent, **over-greasing** the bearings can sometimes lead to heat buildup or sludging, especially in extreme conditions. Proper maintenance is still required to avoid this issue.

6. **Availability and Lead Times**

Like many high-end WTB components, the HB591 may have **longer lead times** due to demand. This could delay your purchase if you re in a hurry.

7. **Not Ideal for Freeride or Big Air**

While the hub is strong, it is **primarily designed for enduro and downhill**, where wheelbursts are less common. For **freeride or big-air riding**, a **full-suspension fork with a more robust wheel setup** (e.g., **DT Swiss XM15 or Race Face Turbine**) might be preferable.

8. **Learning Curve for Installation**

Due to its advanced sealing system, installing or servicing the hub may require **more care than standard hubs**. If you re not experienced with bike maintenance, you might need to take it to a shop for servicing.

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### **Conclusion**

The **WTB HB591 Grease Guard Momentum Front Hub (28H, 100mm, Wilderness Trail)** is one of the best **high-end front hubs** for **enduro and downhill mountain biking**. Its **superior durability, grease guard technology, and lightweight construction** make it an excellent choice for riders who demand reliability in extreme conditions. However, its **high cost, weight compared to carbon options, and overkill for lighter use** mean it may not be the best fit for everyone.

If you **ride heavily in mud, dirt, or rough terrain** and want a hub that **minimizes maintenance and maximizes longevity**, the HB591 is a **top-tier investment**. For **trail riders, cross-country enthusiasts, or those on a budget**, a more affordable hub (e.g., **Shimano Deore, SRAM GX, or DT Swiss M300**) would likely be a better choice.

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### **Recommendation**

- You ride **enduro or downhill frequently** and want a hub that lasts without frequent servicing.

- You frequently ride in **muddy, dirty, or extreme conditions** where protection against debris is critical.

- You prioritize **durability, smoothness, and reliability** over weight savings.

- You re already using **WTB components** and want a cohesive, high-performance setup.

- You ride **primarily on trails or cross-country** and don t need extreme durability.

- You re on a **tight budget** and can find a similarly performing hub at a lower cost (e.g., **DT Swiss XM15, Race Face Turbine**).

- You prefer **carbon hubs** for weight savings and are willing to pay the premium.

- You don t have the budget for **high-end WTB components** and want to allocate funds elsewhere (e.g., suspension, drivetrain).

- For **enduro/downhill riders who want carbon**: **DT Swiss XM15 or Race Face Turbine** (lighter but more expensive).

- For **budget-conscious enduro riders**: **Shimano Deore or SRAM GX hubs** (still durable but less sealed).

- For **freeride/big-air**: **DT Swiss M300 or Race Face Turbine** (more robust wheel systems).

The **WTB HB591 is one of the best front hubs for aggressive riding**, but it s not for everyone. If your riding style and budget align with its strengths, it s a **solid long-term investment**. Otherwise, consider alternatives based on your specific needs.

Details:

Really nice WTB Momentum front hub. Hard to find one this clean. Engraving in amazing shape. Replacement black o-ring on one side.

Sticker in great shape. Early Momentum transition from new paradigm. Not to be mistaken with the later/cheaper Momentum fronts you see for $20 elsewhere.

part #: hb591 prices

• $19.99-$59.99

specifications ribicycl:

• brand: Momentum
• mpn: Hb591
• part type: Grease Guard Hub Bike
• number of spoke holes: 28 Hole
• attachment style: Quick Release
• brake type: Front
• color: Silver
• compatible bike type: Mountain Bike
• material: Aluminum
• set includes: Hubs

seller ribicycl:

• rating: 100.0%
• city: Owosso, Michigan
• # reviews: 195

offer ribicycl:

• quantity: 1
• sold: 0
• started: February 2, 2026
• options: Ship-to-home
• availability: In Stock
• best offers: True

payments ribicycl:

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

general ribicycl:

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

shipping ribicycl:

• type: Calculated
• transit: 3-8 Days
• service: USPS Ground Advantage
• class: Standard
• cost: $7.46
• carrier: USPS

returns ribicycl:

• policy: No Returns