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  3. BOX BXDR2P9AXWCBK

BOX BXDR2P9AXWCBK Prime Mountain Bike Rear Derailleur

Bxdr2p9axwcbk Box Two Prime 9 X-wide Mountain Bike Rear Derailleur

( Brand: Box ), ( Manufacturer Part Number: BXDR2P9AXWCBK ), ( Part Type: Bike Derailleur ), ( Color: Black ), ( Compatible Bike Type: Mountain Bike ), ( Set Includes: Derailleur ), ( Material: Aluminum ), ( Mounting Type: Bolt-on ), ( Number Of Speeds: 9 Speed ), ( Derailleur Cage Length: Long Cage )

Review BOX Two Prime X wide Mountain Bike Rear Derailleur

The **Shimano BXDR2P9AXWC-BK Prime X-Wide Mountain Bike Rear Derailleur** is a high-performance, precision-engineered component designed to elevate your riding experience with unmatched reliability and versatility. Part of Shimano s Prime series, this derailleur is built to handle the most demanding off-road conditions while delivering seamless shifting across a wide range of drivetrain setups. Its **X-Wide design** accommodates modern mountain bike setups, including wide-range cassettes and 1x drivetrains, ensuring compatibility with the latest 11-52T or 11-50T cassettes, as well as 1x12 speed systems. The **BK (Black) finish** not only adds a sleek, professional aesthetic but also helps dissipate heat, contributing to consistent performance under heavy loads.

At the heart of this derailleur is Shimano s **advanced shifting technology**, featuring a **highly durable steel frame** reinforced with precision-machined components to minimize flex and maximize durability. The **dual-pivot design** ensures smooth operation, reducing friction and wear while maintaining precise chain alignment, even on rough terrain. The **adjustable limit screws** allow for fine-tuning of the high and low pulley positions, enabling riders to optimize shifting performance for their specific cassette and terrain demands. Additionally, the **quick-release cage** simplifies maintenance and makes it easy to swap out for different cassette widths, further enhancing its adaptability.

For those who demand performance without compromise, the **Prime series** incorporates **high-quality bearings and seals**, reducing drag and extending the derailleur s lifespan even in the harshest conditions. The **durable hanger** is designed to withstand the stresses of aggressive riding, while the **robust spring mechanism** ensures consistent shifting under varying loads. Whether tackling steep climbs, technical descents, or long-distance trails, this derailleur delivers **reliable, precise shifting** with minimal maintenance, making it an ideal choice for serious mountain bikers who refuse to compromise on performance.

Built to Shimano s exacting standards, the **BXDR2P9AXWC-BK** is a testament to engineering excellence, offering a perfect blend of strength, efficiency, and adaptability. Its compatibility with a wide range of drivetrains, combined with its rugged construction and smooth operation, makes it a standout choice for riders seeking a derailleur that can keep up with their demands on and off the trail.

### **Pros and Cons of the Shimano BXDR2P9AXWCBK (Prime X-Wide Mountain Bike Rear Derailleur)**

#### **Pros:** The Shimano Prime X-Wide rear derailleur (BXDR2P9AXWCBK) is designed for modern mountain biking, offering several advantages:

1. **Wide-Range Compatibility** The "X-Wide" designation means it supports ultra-wide tire setups (up to 50mm or more), making it ideal for plus-sized bikes, trail bikes, and fat bikes. This flexibility is useful for riders who want to run aggressive tire widths without derailleur clearance issues.

2. **Durability and Build Quality** Shimano s Prime series is known for robust construction, with a durable frame and strong pivot points. The derailleur is built to handle rough terrain, making it a reliable choice for aggressive riding.

3. **Smooth Shifting Performance** Shimano s indexing system (especially with Deore or SLX groupsets) provides precise and consistent shifting, even under heavy loads. The Prime series maintains this level of performance while being more affordable than higher-end models.

4. **Lightweight Design** Compared to older models, the Prime X-Wide is relatively lightweight, reducing unsprung weight and improving pedal response.

5. **Compatibility with Modern Groupsets** It works well with Shimano s Deore, SLX, and even some XT components, making it a versatile upgrade option for riders who want wider tire clearance without a full groupset swap.

6. **Cost-Effective Upgrade** For riders who need wider tire clearance but don t want to invest in a full XT or SLX derailleur, the Prime X-Wide offers a balanced performance-to-price ratio.

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#### **Cons:** While the derailleur has many strengths, there are some limitations to consider:

1. **Not as Refined as Higher-End Models** Compared to Shimano s SLX or XT derailleurs, the Prime series lacks some advanced features like **Quick Release (QR) mounting** (though this model does include it) or **ultra-smooth shifting under extreme conditions**. The indexing may not be as precise as higher-tier models in extreme terrain.

2. **Limited Availability of Spare Parts** Shimano has phased out some older Prime components, meaning replacement parts (like cables or hangers) may be harder to find compared to Deore or SLX.

3. **Potential for Wear Over Time** While durable, the Prime X-Wide is not built for extreme endurance racing or professional use. In heavy-duty conditions, wear on the pulleys or cage may occur faster than on SLX or XT models.

4. **Compatibility with Older Groupsets May Be Limited** If you re running an older groupset (e.g., Deore 10-speed), some components (like the chainstay or frame clearance) may still require adjustments to accommodate wider tires.

5. **No Electronic Shifting** Unlike Shimano s Di2 systems, this is a mechanical derailleur, meaning it lacks electronic precision tuning and requires manual adjustment.

6. **Price Still Higher Than Basic Models** While cheaper than SLX/XT, it remains more expensive than entry-level derailleurs (like Shimano Tourney or Altus), so budget-conscious riders may find better value elsewhere.

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### **Conclusion and Recommendation**

The **Shimano BXDR2P9AXWCBK (Prime X-Wide) rear derailleur** is an excellent choice if you need **wide tire clearance** for plus-sized or fat bikes while maintaining **durability and decent shifting performance**. It strikes a balance between affordability and functionality, making it suitable for **trail riding, enduro, and light cross-country** without the premium price of SLX or XT.

**Best for:**

- Riders upgrading from narrow-tire setups to wider tires (35mm 50mm ).

- Those who want a **reliable, mid-range derailleur** without investing in a full high-end groupset.

- Mountain bikers who prioritize **durability and compatibility** over ultra-precise shifting.

**Not ideal for:**

- **Race-focused riders** who need the smoothest possible shifting (SLX/XT would be better).

- Those on a tight budget who can opt for a **Deore XT or lower-tier derailleur** with similar clearance.

- Riders who plan to run **extremely wide tires (55mm )** without checking frame/chainstay clearance.

**Final Recommendation:**

If your primary goal is **wider tire compatibility without sacrificing too much performance**, the **Prime X-Wide is a solid, cost-effective choice**. However, if you re on a budget and can find a **Deore XT or SLX derailleur with X-Wide clearance**, those may offer slightly better longevity and shifting feel. Always ensure your **frame and chainstay can accommodate the tire width** before purchasing.

For most **trail and enduro riders**, this derailleur delivers **great value** and should serve well for years with proper maintenance.

Details:

Great derailleur from a great company that's no longer around. Used for a single test ride of 5 miles. In perfect functional condition.

part #: bxdr2p9axwcbk prices

  • $90.00-$139.99

specifications ribicycl:

  • brand: Box
  • mpn: Bxdr2p9axwcbk
  • part type: Bike Derailleur
  • color: Black
  • compatible bike type: Mountain Bike
  • set includes: Derailleur
  • material: Aluminum
  • mounting type: Bolt-on
  • number of speeds: 9 Speed
  • derailleur cage length: Long Cage

returns ribicycl:

  • policy: No Returns

offer ribicycl:

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

general ribicycl:

  • Cycling > Bicycle Components Parts > Rear Derailleurs
  • condition: Used

shipping ribicycl:

  • cost: $8.46
  • carrier: USPS
  • class: Standard
  • transit: 3-8 Days
  • type: Calculated
  • service: USPS Ground Advantage

payments ribicycl:

  • wallet: Google-pay
  • credit card: Diners-club
  • other

seller ribicycl:

  • # reviews: 155
  • city: Warren, Ohio
  • rating: 100.0%
part type: bike derailleur, compatible bike type: mountain bike, set includes: derailleur, mounting type: bolt-on, number of speeds: 9 speed, derailleur cage length: long cage,
category: sporting goods > cycling > bicycle components parts > rear derailleurs, color: black, material: aluminum, sku: 17359177835927632,
Box BXDR2P9AXWCBK Is Similar To:
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4 offers $90.00–$139.99 USD
  • New. Offer #1 priced at $90.00 + $12.00 shipping estimate = $102.00* total. Wide Range - 11-50t.+$12.00 shipping
  • New. Offer #2 priced at $120.69 + $11.35 shipping estimate = $132.04* total. BILLET BMX BILLET BMX CHAIN TENSIONERS 3/8" 10mm AXLE PAIR.+$11.35 shipping
  • New. Offer #3 priced at $139.99 + $9.35 shipping estimate = $149.34* total. Cage: Forged / Aluminum. Derailleur Hanger: Non-Direct Mount.+$9.35 shipping
  • New. Offer #4 priced at $120.69 + $10.00 shipping estimate = $130.69* total. Cage/Mount: Long. Quality bicycles, wheels, components and accessories.+$10.00 shipping

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