FSA Headset Bearing ACB TH-873DJ - 41mm - 36/45 Degrees
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Product Information
Full details
The FSA TH-873DJ headset bearing is an essential component for cyclists and mechanics seeking a high-precision replacement part for integrated headset systems. Engineered for durability, this Angular Contact Bearing (ACB) provides smooth, reliable steering performance and is ideal for maintaining optimal handlebar responsiveness. While it offers excellent build quality, users must ensure the specific dimensions—41mm outer diameter and 36/45-degree chamfers—are compatible with their frame's existing headset cup before installation.
All features
| Model Part Number | TH-873DJ |
|---|---|
| Brand | FSA |
Extended Product Information
FAQs
What do the 36 and 45 degree angles represent?
These represent the chamfer angles of the bearing. The 36-degree inner angle typically interfaces with the compression ring, while the 45-degree outer angle seats against the headset cup in the frame.
Can I use this for a 41.8mm headtube?
No. This bearing is specific to a 41.0mm outer diameter. Installing it into a 41.8mm cup will create dangerous play and damage the frame.
Is this a sealed bearing?
Yes, it is a sealed Angular Contact Bearing designed to keep out debris while maintaining smooth rotation.
How do I know if my bearing is an MR040?
The bearing will have 'MR040' laser-etched or stamped onto the side of the seal.
How often should I service the headset bearings?
Under normal riding conditions, inspection and re-greasing every 6 months to a year is recommended to prevent seizing.
Troubleshooting
Headset feels gritty or rough when turning
The bearing may be contaminated or worn. Remove the bearing, clean the area, and inspect the races; if the roughness persists, replace the bearing.
Persistent creaking during rides
Ensure the bearing is properly seated in the headtube and that there is adequate high-quality grease applied to the contact surfaces.
Handlebars feel loose after adjustment
Check that the compression ring is correctly positioned above the bearing and that the stem bolts are torqued to the manufacturer's specification.
Pros and Cons
Pros
- High-precision engineering for smooth steering
- Standardized industry sizing for broad compatibility
- Robust construction ensures durability
- Easy to identify via MR040 marking
Cons
- Requires precise measurement of existing frame cups
- Not compatible with standard press-fit or external cup headsets
- Professional installation tools recommended to avoid bearing damage
Setup, Compatibility & Care
Installation of the TH-873DJ requires a clean headtube environment. Before placing the bearing, apply a light layer of high-quality waterproof bicycle grease to the contact surfaces of both the frame's headtube and the bearing's chamfered edges to prevent corrosion and creaking.
Compatibility Note: Always verify your headtube accepts 41mm integrated bearings. Using a bearing with the wrong angle (e.g., 45/45 or 36/36) will result in poor fitment, uneven wear, or damage to the headtube.
Care: To extend the life of your bearings, avoid using high-pressure water spray directly at the headset interface, as this can force out the internal lubricants and introduce contaminants.