RACE FACE HUB21T148X32HXDSBLKR Trace Rear Hub Boost Sram Xd 821973391915 12X148
( Brand: Race Face ), ( Manufacturer Part Number: HUB21T148X32HXDSBLKR ), ( Part Type: Hub ), ( Attachment Style: 6 Bolt Brake Mount ), ( Color: Black ), ( Item Diameter: 12 Mm ), ( Material: Steel ), ( Set Includes: Hubs ), ( Item Length: 148 Mm ), ( Number Of Speeds: 11 Speed ), ( Number Of Spoke Holes: 32 Hole ), ( Freehub/driver Type: Sram Xd ), ( Brake Type: Rear ), ( Compatible Bike Type: Mountain Bike ), ( UPC: 821973391915 )
Review RACE FACE Trace Rear Hub 12x148 Boost Sram Xd 32h Black
The **Race Hub 21T148x32HxDS-BLKR Trace Rear Hub** is a high-performance, all-terrain rear hub designed for modern mountain bikes and hardtail trail rigs that demand precision, durability, and adaptability. Built with SRAM s cutting-edge **XDR (eXtreme Durability Rear) technology**, this hub is engineered to withstand the rigors of aggressive riding, from steep descents and rocky climbs to deep sand and muddy trails, without compromising on smoothness or reliability. The **Boost 148mm axle standard** ensures compatibility with the latest frame designs, offering a wider wheelbase and enhanced stability, while the **32-hole spacing** provides a balanced fit for both disc-brake and suspension systems, catering to riders who prioritize both performance and versatility.
At the core of this hub is the **Trace bearing system**, a refined evolution of SRAM s proven technology, delivering ultra-low friction and exceptional durability. The **21-speed cassette compatibility** makes it ideal for riders who demand a wide gear range, whether tackling technical singletrack or crushing enduro laps. The **DS (Dual Seal) bearing design** ensures long-lasting protection against dirt, moisture, and debris, reducing maintenance needs and extending the hub s lifespan critical for riders who push their bikes to the limit. The **BLKR (Black Rock) variant** features a sleek, matte-black finish paired with contrasting accents, offering both aesthetic appeal and a subtle nod to off-road aggression, making it a standout choice for riders who want their gear to reflect their adventurous spirit.
For those seeking a hub that bridges the gap between trail and enduro, the **Trace Rear Hub** excels with its **12mm axle interface**, which allows for easy integration with aftermarket disc brake systems and suspension components. The **148mm Boost standard** not only improves handling but also future-proofs the setup, ensuring compatibility with the latest frame and fork designs. Whether paired with wide, knobby tires for maximum grip or lighter, faster-rolling options for speed-focused riding, this hub remains a steadfast performer. Built to handle the demands of serious riders, the **Race Hub 21T148x32HxDS-BLKR Trace Rear Hub** is a testament to SRAM s commitment to innovation, blending cutting-edge engineering with the rugged reliability needed to conquer any trail.
### **Pros and Cons of buying a Race Hub 21T 148x32H XDS-BLK-R Trace Rear Hub (12x148 Boost, SRAM XD 32H)**
#### **Pros:**1. **High-Quality Materials and Build**
The Race Hub is constructed with durable aluminum and high-grade steel components, ensuring longevity and reliability. The **XDS-BLK-R (Black Race) model** features a sleek, reinforced design optimized for performance and durability.
2. **Boost Compatibility**
The **148mm axle width** is compatible with **Boost (148mm) and Super Boost (157mm) frames**, making it a versatile choice for modern mountain bikes. This ensures a secure fit on newer, wider-frame bikes.
3. **SRAM XD Drive (32H)**
The **SRAM XD drive compatibility** (32mm spacing) is a significant advantage, as it allows for wider tire clearance, improving traction and stability on rough terrain. This is particularly useful for **enduro, downhill, and trail riding** where wider tires are beneficial.
4. **Trace Rear Hub Design**
The **Trace hub** is designed for **better chainline stability and reduced chain tension**, which can improve shifting performance and reduce wear on drivetrain components. This is especially useful for bikes with **wide-range drivetrains** (e.g., 1x12 or 1x13).
5. **Lightweight Construction**
The hub is engineered to be **lighter than traditional steel hubs**, reducing unsprung weight and improving pedal response. This is beneficial for **cross-country and trail riding** where weight efficiency matters.
6. **Sealed Bearings for Low Maintenance**
The hub features **sealed bearings**, which reduce the need for frequent lubrication and maintenance. This makes it a practical choice for riders who prefer low-maintenance components.
7. **Wide Tire Clearance**
The **32H spacing** allows for **32mm-wide tires**, which provide better grip, comfort, and durability on rough trails. This is ideal for **all-mountain and downhill riding**.
8. **Compatibility with Modern Bikes**
The hub is designed to work seamlessly with **modern frame designs**, including **carbon and aluminum bikes**, making it a flexible upgrade option.
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#### **Cons:**1. **Higher Cost Compared to Standard Hubs**
The **Race Hub** is a premium component, and its price is significantly higher than standard **steel or basic aluminum hubs**. This may be a drawback for riders on a tight budget.
2. **Specialized Compatibility Requirements**
While it works well with **Boost and Super Boost frames**, it may not fit older bikes with **standard (100mm or 120mm) axles**. Riders with legacy frames may need additional spacers or adapters, adding complexity.
3. **Limited Availability of Spare Parts**
As a **high-end, niche component**, finding replacement parts (e.g., bearings, seals) may be more difficult than with mass-produced hubs. This could lead to longer wait times for repairs.
4. **Potential Overkill for Light Use**
If you primarily ride **gravel, fitness, or casual trail bikes**, the **extra cost and weight savings** of a Race Hub may not justify the investment. A standard **12x148 Boost hub** (e.g., from Shimano or SRAM) might suffice.
5. **Learning Curve for Installation**
Due to its **Boost compatibility and precise chainline requirements**, installing the hub may require **specialized tools and expertise**. Riders without mechanical experience may need to seek professional help, increasing labor costs.
6. **Weight vs. Durability Trade-off**
While the hub is **lighter than steel alternatives**, some riders may prefer the **extra durability** of a heavier steel hub for extreme conditions (e.g., aggressive downhill racing).
7. **Potential for Higher Wear on Drivetrain**
The **Trace hub s design** (while improving chainline) may slightly increase **chain and cassette wear** if not properly maintained. Riders with **wide-range drivetrains** (e.g., 1x12) should ensure proper tension and alignment.
---
### **Conclusion and Recommendation**
The **Race Hub 21T 148x32H XDS-BLK-R Trace Rear Hub** is an **excellent choice** for riders who prioritize **performance, durability, and modern bike compatibility**. Its **Boost/Super Boost fitment, SRAM XD 32H clearance, and lightweight construction** make it ideal for **all-mountain, enduro, and downhill riding**, where wider tires and precise chainline stability are advantageous.
However, the **higher cost, specialized requirements, and potential maintenance challenges** mean it may not be the best fit for **budget-conscious riders or those on standard-frame bikes**. If you re upgrading a **Boost-compatible bike** (especially with a **wide-range drivetrain**) and can justify the investment, this hub is a **strong recommendation**.
**For most riders:**- If you have a **Boost/Super Boost frame** and ride **aggressively (trail, enduro, DH)**, the Race Hub is a **worthwhile upgrade**.
- If you ride **lightly or on standard frames**, a **standard 12x148 Boost hub** (e.g., Shimano Saint, SRAM GX) may be a more cost-effective alternative.
**Final Verdict:****Buy it if** you need a **high-performance, durable, and versatile rear hub** for a **modern Boost/Super Boost bike** with wide tire clearance.
**Skip it if** you re on a budget, have a **standard-frame bike**, or prefer a simpler, more accessible hub.
Details:
The Race Face TRace Rear Hub is a high-quality, durable component designed for mountain bikes. With a 6-bolt brake mount and 11-speed EMT rated compatibility. This hub is a top choice for serious riders seeking performance and durability. The sleek black color and steel construction make it a stylish reliable choice for your cycling needs.
This hub features a 12x148 Boost size, 32h spoke holes, and is compatible with SRAM XD drivers.
part #: 821973391915 prices
- $222.35-$230.99
specifications ribicycl:
- brand: Race Face
- mpn: Hub21t148x32hxdsblkr
- part type: Hub
- attachment style: 6 Bolt Brake Mount
- color: Black
- item diameter: 12 Mm
- material: Steel
- set includes: Hubs
- item length: 148 Mm
- number of speeds: 11 Speed
- number of spoke holes: 32 Hole
- freehub/driver type: Sram Xd
- brake type: Rear
- compatible bike type: Mountain Bike
- upc: 821973391915
payments ribicycl:
- other
- credit card: Visa
- wallet: Google-pay
returns ribicycl:
- policy: No Returns
seller ribicycl:
- city: Bellingham, Washington
- # reviews: 868
- rating: 100.0%
offer ribicycl:
- sold: 0
- options: Ship-to-home
- quantity: 1
- started: April 13, 2026
- availability: In Stock
shipping ribicycl:
- cost: $0.00
- type: Calculated
- class: Economy
- carrier: UPS
- transit: 4-11 Days
- service: UPS Ground Saver
general ribicycl:
- condition: Used
- Cycling > Bicycle Components Parts > Hubs
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