FSA Afterburner Crankset Mountain Bike Mtb 400310014146 BB30 39-27 175 312-0346 X10

( Brand: Fsa ), ( Manufacturer Part Number: AFTERBURNER ), ( Part Type: Bike ), ( Crankarm Length: 175 Mm ), ( Color: Black ), ( Compatible Bike Type: Mountain Bike ), ( Bottom Bracket Shell Type: Bb30 ), ( Number Of Chainrings: Double ), ( Country Of Origin: Taiwan ), ( UPC: 400310014146 )

Review FSA Bb30 39-27 175 Crankset Mountain Bike X10 Mtb Speed

The **FSA BB30 39-27 175mm Afterburner crankset (Model FSA 400310014146)** is a high-performance, trail-ready component designed for mountain bikers seeking a balance of efficiency, durability, and aggressive climbing capability. Engineered specifically for 10-speed drivetrains, this crankset integrates seamlessly with the BB30 bottom bracket standard, offering a compact yet powerful platform for riders pushing the limits of enduro, downhill, and cross-country disciplines. The **39/27 tooth chainring combination** delivers a progressive gearing ratio, allowing for nimble acceleration out of tight corners while maintaining strong climbing efficiency ideal for riders who demand versatility across varied terrain. With a **175mm BCD (bolt circle diameter)**, it accommodates a wide range of chainline adjustments, ensuring optimal chain alignment and reduced wear on drivetrain components, even under heavy loads. Crafted from **high-grade aluminum alloy**, the crankset features a robust yet lightweight construction, minimizing rotational weight without compromising rigidity. The **X10 compatibility** ensures flawless integration with Shimano s 10-speed groupsets, including the Deore, SLX, and XT lines, making it a versatile choice for riders upgrading or building a system around a proven drivetrain. The **Afterburner** designation underscores its aggressive, performance-oriented design, with precision-machined splines and optimized chainline geometry to maximize power transfer and reduce pedal stroke fatigue. Whether tackling steep climbs, technical descents, or fast-flowing trails, this crankset provides the responsiveness and reliability expected from FSA s premium components, making it a standout choice for serious mountain bikers who refuse to compromise on performance.

### **Pros and Cons of buying a FSA 400310014146 Afterburner BB30 39-27 175 Crankset for Mountain Biking**

1. **Performance-Oriented Design** The Afterburner crankset is engineered for aggressive riding, offering a stiff and responsive platform that enhances power transfer, especially useful for downhill and trail riding.

2. **BB30 Bottom Bracket Standard** BB30 is a modern standard that provides a wider axle spacing (100mm) compared to older standards (e.g., 68mm), improving pedal stroke efficiency and reducing stress on the frame.

3. **Wide Range of Chainrings (39-27)** The 39-tooth large chainring and 27-tooth small chainring offer a versatile gearing setup, allowing for better climbing efficiency while maintaining speed on descents.

4. **Lightweight Construction** FSA (now part of Shimano) cranks are known for their durability and relative lightweight, which can improve pedal feel and reduce fatigue on long rides.

5. **Compatibility with X10 Groupset** The crankset is designed to work seamlessly with the Shimano X10 drivetrain, ensuring smooth shifting and reliable performance.

6. **Durability** The Afterburner line is built for rough terrain, with reinforced components to withstand heavy use in mountain biking.

7. **Aftermarket Support** FSA (now Shimano) components have a strong aftermarket presence, making it easier to find replacement parts or upgrades if needed.

1. **Niche BB30 Standard** While BB30 offers advantages, it is less common than traditional standards like PressFit or Square Taper. This means fewer frames and forks are compatible, limiting your bike selection if you plan to build or upgrade.

2. **Potential Compatibility Issues** If you re retrofitting this crankset onto an existing bike, ensure the frame and fork are BB30-compatible. Mismatches can lead to misalignment or damage.

3. **Cost Relative to Alternatives** While not excessively expensive, the Afterburner crankset may be pricier than entry-level options from other brands (e.g., SRAM or Enve) with similar performance characteristics.

4. **Weight Consideration** While lightweight, the crankset may still be heavier than ultra-lightweight options (e.g., carbon cranks), which could be a minor drawback for endurance riders.

5. **Learning Curve for BB30 Installation** If you re not familiar with BB30 bottom brackets, installation can be more complex than traditional standards, requiring proper tools and technique.

6. **Limited Customization** Unlike some aftermarket cranks, the Afterburner line has fixed chainring sizes (39-27), so you cannot swap them for other ratios unless you modify the setup.

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The **FSA 400310014146 Afterburner BB30 39-27 175 crankset** is an excellent choice for mountain bikers who prioritize performance, stiffness, and a modern BB30 standard. It excels in aggressive riding conditions and pairs well with the Shimano X10 groupset, offering a balance of durability and efficiency. However, its BB30 compatibility limits frame options, and the cost may be higher than some alternatives. If you re building a bike from scratch or upgrading a BB30-compatible frame, this crankset is a strong, reliable option.

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- You re building or upgrading a BB30-compatible mountain bike.

- You want a stiff, responsive crankset for aggressive riding (downhill, trail, or enduro).

- You re using it with a Shimano X10 drivetrain and prefer FSA s build quality.

- You re okay with the slightly higher cost for performance gains.

- You need wider frame compatibility (e.g., PressFit or Square Taper bottom brackets).

- You re on a tight budget and can find a similarly performing crankset from another brand.

- You prioritize ultra-lightweight cranks (e.g., carbon options) over stiffness.

For most mountain bikers seeking a balance of performance and durability, this crankset is a **solid recommendation**, provided the BB30 compatibility aligns with your bike setup.

Details:

FSA Afterburner BB30 Crankset 39/27T 175mm. Part number312-0346. Excellent condition, looks as if it was installed but never used. Includes original box, crank arms, double chainrings, various bearings/clips/hardware, FSA BB30 crankset bearing reload tool, and instruction sheets.

part #: afterburner prices

• $24.97-$149.99

specifications ribicycl:

• brand: Fsa
• mpn: Afterburner
• part type: Bike
• crankarm length: 175 Mm
• color: Black
• compatible bike type: Mountain Bike
• bottom bracket shell type: Bb30
• number of chainrings: Double
• country of origin: Taiwan
• upc: 400310014146

shipping ribicycl:

• service: USPS Ground Advantage
• transit: 4-10 Days
• cost: $13.85
• carrier: USPS
• type: Calculated
• class: Standard

general ribicycl:

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

returns ribicycl:

• policy: No Returns

payments ribicycl:

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

seller ribicycl:

• # reviews: 3400
• rating: 100.0%
• city: Coulterville, Illinois

offer ribicycl:

• quantity: 1
• options: Ship-to-home
• started: March 2, 2026
• sold: 0
• availability: In Stock

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