OMNI OM866CM Racer Bottom Bracket Square Taper 2.0

( Brand: Omni ), ( Manufacturer Part Number: OM866CM ), ( Part Type: Bottom Bracket ), ( Shell Width: 68 Mm ), ( Spindle Type: Square Taper Jis ), ( Bottom Bracket Shell Type: Bsa ), ( Compatible Bike Type: Mountain Bike, Road Bike ), ( Item Length: 127.5mm ), ( Item Weight: 236 Grams )

Review OMNI Racer Bottom Bracket 2.0 Square Taper

The **Omni OM866CM Racer Bottom Bracket 2.0 (Square Taper)** is a high-performance, precision-engineered component designed to elevate the rigidity, durability, and efficiency of your bicycle s drivetrain, particularly in aggressive racing and high-stress applications. Crafted from a proprietary **aerospace-grade aluminum alloy**, this bottom bracket features a robust, lightweight construction that delivers exceptional stiffness while minimizing rotational friction a critical advantage for climbers, sprinters, and time trialists who demand every ounce of power transfer. The **2.0 square taper standard** ensures compatibility with a wide range of modern cranks, including those from top-tier brands like Shimano, SRAM, and FSA, while the **68mm spindle width** (adjustable to 66.6mm for compatibility with certain models) provides a balanced fit for both road and gravel bikes. The **dual-bearing design** incorporates sealed cartridge bearings that are pre-lubricated with long-lasting, high-temperature grease, reducing maintenance demands and extending service life under extreme conditions. Engineered with a **threaded shell** for secure installation, the OM866CM features a **precision-machined cup interface** that eliminates play, ensuring consistent crankarm alignment and optimal chainline accuracy essential for maintaining efficiency over rough terrain or at high speeds. Its **compact, streamlined profile** minimizes interference with frame geometry, making it an ideal choice for bikes with aggressive tube angles or carbon frames where weight and clearance are paramount. Whether you re pushing the limits in a criterium race, tackling grueling climbs, or chasing speed on a gravel adventure, the Omni OM866CM Racer Bottom Bracket 2.0 delivers the strength, responsiveness, and reliability needed to keep you ahead of the competition. Built to withstand the demands of professional-level riding, this component is a testament to Omni s commitment to innovation, ensuring that every pedal stroke translates into maximum power without compromise.

### **Pros and Cons of buying a OMNI OM866CM Racer Bottom Bracket (2.0 Square Taper)**

1. **High-Quality Materials and Construction**

The OMNI OM866CM is made from high-grade steel, ensuring durability and resistance to wear over time. The precision-machined components reduce friction, which can improve pedaling efficiency.

2. **Lightweight Design**

Despite its strength, the bottom bracket is relatively lightweight, which can contribute to a more responsive and agile bike setup, especially in racing or performance-oriented applications.

3. **Compatibility with Square Taper Cranks**

The 2.0 square taper standard is widely used in road and gravel bikes, making it easy to find compatible cranks, pedals, and other components. This ensures a broad selection of parts for customization or upgrades.

4. **Sealed Bearings for Low Maintenance**

The sealed bearings reduce the need for frequent lubrication and maintenance, which is convenient for riders who prefer a hassle-free setup. This also helps prevent dirt and moisture from entering the bearing assembly.

5. **Reliability for Racing and Performance**

The "Racer" designation suggests that this bottom bracket is designed for performance-oriented use, including racing. Its robust construction can handle the stresses of high-speed riding and aggressive pedaling.

6. **Widely Available and Supported**

OMNI is a well-known brand in the cycling industry, and this bottom bracket is part of their popular OM866 series. It is easy to find in bike shops, online retailers, and through authorized dealers, ensuring availability for repairs or replacements.

7. **Compatibility with Common Frame Standards**

The OM866CM fits standard frame shell widths (typically 68mm or 73mm), making it a versatile choice for many bikes without requiring extensive modifications.

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1. **Square Taper Limitations**

While square taper cranks are common, they are not as widely used as modern standards like Hollowtech II or Octalink. This means fewer high-end or specialized crank options are available compared to systems like Shimano s SPD-SL or SRAM s Dual Channel.

2. **Potential for Wear Over Time**

Like all mechanical components, square taper bottom brackets can experience wear at the bearing cups or the crank interface. Over time, this may require replacement or adjustment, though the quality of the OMNI parts helps mitigate this issue.

3. **Less Common in Modern Bikes**

Many newer bikes, especially those designed for gravel, mountain biking, or e-bikes, may use alternative bottom bracket standards (e.g., BB86, BB92, or press-fit). This could limit its use in newer or more specialized frames.

4. **Higher Initial Cost Compared to Basic Options**

While not excessively expensive, the OMNI OM866CM is positioned as a mid-to-high-end product. Budget-conscious riders might find cheaper alternatives from other brands, though they may sacrifice quality or durability.

5. **Installation Requires Precision**

Installing a square taper bottom bracket correctly is critical to avoid damage to the bearings or frame. Improper installation can lead to premature wear or failure, so riders without experience may need to seek professional help.

6. **Limited Customization for Non-Standard Frames**

If your frame has a non-standard shell width or spacing, compatibility may be an issue. Always verify measurements before purchasing to ensure a proper fit.

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### **Conclusion**

The **OMNI OM866CM Racer Bottom Bracket (2.0 Square Taper)** is an excellent choice for riders who prioritize durability, performance, and compatibility with square taper cranks. Its high-quality construction, lightweight design, and low-maintenance sealed bearings make it a reliable option for road and racing applications. However, its square taper standard may limit future upgrades or compatibility with newer bike models, and installation requires care to avoid issues.

If you are building or upgrading a bike that uses square taper cranks and fits standard frame shell widths, this bottom bracket is a strong recommendation. For riders considering modern standards like Hollowtech II or Octalink, exploring alternatives may offer more long-term flexibility.

### **Recommendation**

- You are using square taper cranks (e.g., Shimano, SRAM, or other compatible brands).

- Your frame has a standard shell width (68mm or 73mm) and fits the OM866CM dimensions.

- You value durability, low maintenance, and performance in racing or high-demand riding.

- You prefer a well-supported, high-quality component from a reputable brand.

- You are building a bike with a non-standard bottom bracket standard (e.g., BB86, press-fit).

- You want future-proofing with modern crank systems like Hollowtech II or Octalink.

- You are on a tight budget and can find equally durable budget options from other brands.

Details:

Italian 70mm: ITA 36x24T R/R cups. See Pictures for all measurements. RACER JIS 2.0 Square Taper Bottom Bracket: English 68mm: BSA 1.37 x24T R/L cups. Installation: ISIS tool, Shaman Octal ink, or Park Tool #BBT-22, #BBT-32.

MTB English 73mm: BSA 1.37 x24T R/L cups.

part #: om866cm price

• $59.88

specifications ribicycl:

• brand: Omni
• mpn: Om866cm
• part type: Bottom Bracket
• shell width: 68 Mm
• spindle type: Square Taper Jis
• bottom bracket shell type: Bsa
• compatible bike type: Mountain Bike, Road Bike
• item length: 127.5mm
• item weight: 236 Grams

shipping ribicycl:

• class: Standard
• carrier: USPS
• cost: $9.42
• transit: 5-11 Days
• type: Calculated
• service: USPS Ground Advantage

payments ribicycl:

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

seller ribicycl:

• rating: 100.0%
• city: Portsmouth, New Hampshire
• # reviews: 132

returns ribicycl:

• time: 14 Days
• method: Money back
• paid by: Buyer
• policy: Returns Accepted

general ribicycl:

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

offer ribicycl:

• availability: In Stock
• quantity: 1
• sold: 0
• options: Ship-to-home
• started: May 30, 2026

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