FSA ACB NO.54 Headset Bearing - 46.9mm - 45/45 Degree
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Team CyclesFsa Unisex Silver Acb No.54 1.1/4 46.9Mm 45/45 Headset Bearing In
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Product Information
Full details
The FSA ACB NO.54 Headset Bearing is designed for road and mountain cyclists who require a high-precision replacement part to maintain smooth, jitter-free steering. Engineered with specific contact angles, this component ensures excellent load distribution within compatible tapered headtubes, though users must verify their exact frame specifications, as headset bearings are highly specialized and not universally interchangeable.
All features
| Model Part Number | 160-6752 |
|---|---|
| Brand | FSA |
Extended Product Information
FAQs
What are the dimensions of this bearing?
The bearing has an outside diameter of 46.9mm, an inside diameter of 37.0mm, and a height of 7.0mm.
Can I use this in a non-FSA headset?
You can use it in other brands if the dimensions (46.9/37.0/7.0mm) and the 45/45 degree angles match your specific frame and headset requirements.
Does this bearing come with a crown race?
No, this is a replacement bearing cartridge only.
How often should I service this bearing?
Service intervals depend on riding conditions. In dry conditions, a yearly inspection is sufficient, while frequent wet or muddy riding may require cleaning and re-greasing every few months.
What does 'ACB' stand for?
ACB stands for Angular Contact Bearing, which is a type of bearing designed to handle both radial and axial loads efficiently.
Troubleshooting
Steering feels 'notchy' or rough
Remove the bearing, clean the seat, and apply fresh waterproof grease. If the issue persists, the internal races are likely worn and the bearing must be replaced.
Clicking sound during front braking
The headset preload is likely loose. Loosen the stem bolts and tighten the top cap bolt slightly to remove excess play before retightening the stem.
Pros and Cons
Pros
- High-precision angular contact design
- Standardized dimensions for broad compatibility with FSA integrated systems
- Smooth rotation reduces steering friction
- Robust build quality for long-term reliability
Cons
- Not compatible with all headset standards
- Requires proper grease application for longevity
- Non-serviceable sealed cartridge design
Setup, Compatibility & Care
To install this bearing, ensure the headtube seat is clean and free of debris. Apply a thin layer of high-quality waterproof bike grease to the bearing seat and the bearing exterior before insertion. Always ensure the 45-degree chamfer is oriented correctly against the fork crown race and the headset cover. Compatibility is key; verify your bike's original headset specification to ensure the 46.9mm outside diameter matches your frame. Regularly check for play in the headset by holding the front brake and rocking the bike; if play exists, adjust your stem top cap to apply proper preload, but avoid overtightening, which can prematurely wear the bearing races.