Trek Knock Block Headset – 1-1/8", FSA, with Bearings & Spacers, No Stop Chip
The Trek Knock Block Headset (1-1/8") by FSA is designed for Trek frames using the Knock Block system, offering smooth steering and protection against handlebar over-rotation. This headset includes precision 42E bearings, a 72° AL7075 alloy top cap with anodized black finish, compression spacer, crown race, and a frame chip with locating pin holes and bolt. This version does not include the Knock Block stop chip, making it ideal for riders who already have the stop chip installed or do not require it.
Why you’ll like it
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Complete kit – includes bearings, top cap, compression spacer, crown race
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72° AL7075 alloy top cap – strong, lightweight, and anodized black for durability.
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42E sealed bearings – provide smooth, long-lasting steering performance.
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Knock Block frame chip – designed for alignment and frame integration.
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FSA quality – co-branded with FSA for trusted performance.
What’s in the box
- 1 × 72° AL7075 alloy top cap (black anodized, FSA logo)
- 1 × Set of 42E headset bearings
- 1 × Compression spacer
- 1 × Crown race
- 1 × Frame chip with locating pin holes and bolt
Tech specs
| Manufacturer |
Trek / FSA |
| Model |
Knock Block Headset (No Stop Chip) |
| Size |
1-1/8" |
| Top Cap |
72° AL7075 alloy, anodized black |
| Bearings |
42E sealed cartridge |
| Included Hardware |
Top cap, bearings, compression spacer, crown race, frame chip with bolt |
| Stop Chip |
Not included |
| Finish |
Black anodized |
| Application |
Trek frames equipped with Knock Block system (without stop chip) |
Fit notes
- Designed for Trek frames using the Knock Block headset system.
- This version does not include the Knock Block stop chip – verify if your frame requires one.
- Includes all other parts for a complete headset installation.
