CHRIS KING AAY1 Threadfit Bottom Bracket Bsa Spindle THREADFIT24 0841529072587 24MM

( Brand: Chris King ), ( Manufacturer Part Number: AAY1 ), ( Model: THREADFIT24 ), ( Part Type: Bottom Bracket ), ( Manufacturer Warranty: Lifetime ), ( Shell Width: 68 Mm / 73 Mm ), ( Color: Black ), ( Bottom Bracket Shell Type: Bsa Threaded ), ( Compatible Bike Type: Road Bike ), ( Material: Cnc-machined Aluminum Cups ), ( UPC: 841529072587 )

Review CHRIS KING Threadfit Bottom Bracket Bsa Spindle Black

The **Chris King AAY1 ThreadFit 24 Bottom Bracket** represents a pinnacle of precision engineering and performance in the cycling world, designed specifically for modern, high-performance road and gravel bicycles equipped with 24mm spindle bottom brackets. This meticulously crafted component is the result of decades of innovation by Chris King, a brand synonymous with uncompromising quality, durability, and smooth operation. The **ThreadFit 24** system is a proprietary design that replaces the traditional square taper interface with a threaded spindle, eliminating the need for a spindle nut and providing a more rigid, vibration-dampening connection between the crankset and frame. This threaded interface not only enhances power transfer but also reduces the potential for wobble or play, ensuring a more efficient and responsive ride. The **BSA 24mm spindle** a standard in many modern road and gravel bikes fits seamlessly into this system, offering a perfect balance between compatibility and performance. Constructed from high-grade steel, the AAY1 bottom bracket is heat-treated and precision-machined to exacting tolerances, ensuring longevity and resistance to wear even under the most demanding conditions. Its sealed cartridge design houses a pair of high-performance bearings that are pre-lubricated and protected from contaminants, reducing maintenance requirements while maintaining effortless rotation. Whether paired with a lightweight carbon or durable aluminum crankset, this bottom bracket delivers a smooth, buttery-smooth pedal stroke, making it an ideal choice for cyclists who demand the best in performance and reliability. The AAY1 s compatibility with a wide range of cranksets from entry-level to high-end makes it a versatile upgrade for riders looking to refine their bike s feel and efficiency without sacrificing compatibility. With its blend of cutting-edge engineering, superior craftsmanship, and proven durability, the Chris King AAY1 ThreadFit 24 Bottom Bracket stands as a testament to the brand s commitment to excellence, offering riders a bottom bracket that not only meets but exceeds the expectations of even the most discerning cyclists.

The Chris King AAY1 ThreadFit 24 Bottom Bracket is a high-end component designed for performance-oriented cyclists, particularly those riding in the road or gravel disciplines. Below is a detailed breakdown of its pros and cons, followed by a conclusion and recommendation.

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### **Pros**

1. **Superior Performance and Efficiency**

The AAY1 is engineered for maximum power transfer and minimal rotational resistance. Its precision-machined components and high-quality bearings ensure smooth crankarm rotation, which translates to better efficiency, especially in high-speed or endurance rides. The ThreadFit 24 design reduces friction compared to traditional threaded bottom brackets, making it ideal for performance-focused riders.

2. **Durability and Longevity**

Chris King components are renowned for their durability. The AAY1 is built with hardened steel and high-quality bearings that can withstand significant stress without wear or failure. This makes it a long-term investment, particularly for riders who prioritize reliability over frequent replacements.

3. **Compatibility with a Wide Range of Drivetrains**

The AAY1 is compatible with most modern road and gravel cranksets, including Shimano, SRAM, and FSA designs, thanks to its 24mm spindle width. This flexibility makes it a versatile choice for riders upgrading or replacing their bottom bracket without needing to change other components.

4. **Lightweight Construction**

While not the absolute lightest option on the market, the AAY1 is still relatively lightweight for its class, contributing to an overall lighter bike setup. This is particularly beneficial for climbers or riders who prioritize weight savings.

5. **Precision Engineering and Build Quality**

Chris King is known for its meticulous manufacturing processes. The AAY1 is precision-ground and assembled to tight tolerances, ensuring a smooth ride and reducing the risk of premature failure. The company also offers a lifetime warranty on its bottom brackets, reflecting its confidence in the product s durability.

6. **Compatibility with External Bearings**

The ThreadFit 24 design allows for the use of external bearings (such as those found in some carbon frames), which can further reduce friction and improve performance. This is a feature that appeals to performance-oriented riders and frame manufacturers.

7. **Aesthetic Appeal**

The AAY1 has a sleek, minimalist design that appeals to riders who value both function and form. Its clean lines and polished finish make it a visually pleasing component, often used as a statement piece on high-end builds.

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### **Cons**

1. **High Cost**

The AAY1 is one of the most expensive bottom brackets on the market. Priced significantly higher than entry-level or mid-range alternatives (e.g., Shimano Hollowtech II or SRAM DUB), it may not be justified for casual riders or those on a tight budget. The cost reflects its premium build quality, but it may be overkill for riders who don t prioritize performance above all else.

2. **Limited Availability and Installation Complexity**

The AAY1 requires specialized tools for installation, such as a ThreadFit 24 press fit tool or a compatible bottom bracket tool. This can make installation more challenging for DIYers without the right equipment, and it may necessitate visiting a bike shop for proper fitting. Additionally, not all frames are compatible with the ThreadFit 24 design, as it requires a press-fit bottom bracket shell (common in modern carbon frames but less so in older or aluminum frames).

3. **Overkill for Casual Riders**

If you re not a competitive cyclist or don t ride frequently, the performance gains of the AAY1 may not be noticeable or worth the investment. For recreational riders, a more affordable bottom bracket (e.g., a high-quality Hollowtech II or DUB) may offer sufficient performance without the premium price.

4. **Potential for Over-Tightening**

Due to its precision design, the AAY1 can be sensitive to overtightening during installation. If not installed correctly, it could lead to binding or premature wear. This requires careful attention to torque specifications and proper tooling, which may deter riders who prefer simpler, more forgiving components.

5. **Weight Considerations in Some Cases**

While the AAY1 is lightweight for its class, some ultra-lightweight or gravel-specific bottom brackets (e.g., certain carbon or titanium options) may still outperform it in terms of sheer weight savings. However, the performance benefits often outweigh the marginal weight difference for most riders.

6. **Limited Aftermarket Support**

While Chris King is a respected brand, its components are not as widely supported in the aftermarket as Shimano or SRAM parts. This means finding replacement parts or accessories (e.g., bottom bracket tools) may be more difficult or expensive compared to more mainstream brands.

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### **Conclusion**

The Chris King AAY1 ThreadFit 24 Bottom Bracket is a standout product for riders who demand the highest level of performance, durability, and precision. Its advantages in efficiency, build quality, and compatibility make it an excellent choice for competitive cyclists, endurance riders, and those building high-performance road or gravel bikes. However, its high cost, installation complexity, and lack of necessity for casual riders may make it less appealing to a broader audience.

If you re a serious cyclist who rides frequently, prioritizes performance, and can justify the investment, the AAY1 is a fantastic choice. For recreational riders or those on a budget, a more affordable but still high-quality bottom bracket (e.g., Shimano Hollowtech II, SRAM DUB, or even some aftermarket options like FSA or Rotor) may offer a better balance of cost and performance.

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### **Recommendation**

- You are a competitive or serious endurance rider who rides frequently and prioritizes performance.

- You re building a high-end road or gravel bike and want the best bottom bracket available.

- Your frame is compatible with ThreadFit 24 (press-fit bottom bracket shell).

- You re willing to invest in a component that will last a lifetime with proper care.

- You re a casual rider or don t ride often enough to justify the cost.

- Your frame requires a threaded bottom bracket shell (e.g., older aluminum frames).

- You prefer simpler, more affordable components or lack the tools/knowledge for proper installation.

- You re primarily concerned with weight savings over performance (in which case, some carbon or titanium bottom brackets may be lighter).

For most riders, the AAY1 is a "dream component" that delivers unmatched performance but is only truly necessary for those at the top of their game. For everyone else, there are plenty of excellent alternatives that offer a better cost-to-performance ratio.

Details:

These retail for $200 Chris King 68mm BB that came off a beautifully maintained Baum Corrector road bike IYKYK. This BB has years of life left in it. The only reason I'm selling this is because I switched to a Campanile group set and crank. It looks worn since its a BB, and I haven't cleaned the exteriors, but bearings run as smooth Chris King.

part #: aay1 prices

• $100.00-$237.34

specifications ribicycl:

• brand: Chris King
• mpn: Aay1
• model: Threadfit24
• part type: Bottom Bracket
• manufacturer warranty: Lifetime
• shell width: 68 Mm / 73 Mm
• color: Black
• bottom bracket shell type: Bsa Threaded
• compatible bike type: Road Bike
• material: Cnc-machined Aluminum Cups
• upc: 841529072587

shipping ribicycl:

• transit: 4-10 Days
• service: USPS Ground Advantage
• carrier: USPS
• class: Standard
• type: Calculated
• cost: $10.50

offer ribicycl:

• options: Ship-to-home
• availability: In Stock
• quantity: 1
• best offers: True
• started: March 22, 2026
• sold: 0

general ribicycl:

• condition: Used
• Cycling > Bicycle Components Parts > Bottom Brackets

seller ribicycl:

• city: San Francisco, California
• rating: 100.0%
• # reviews: 12

returns ribicycl:

• policy: No Returns

payments ribicycl:

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

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