Trek Knock Block Headset – 1-1/8", FSA, with Bearings, Spacers, Crown Race & Chip
The Trek Knock Block Headset is a complete OEM replacement headset system designed for Trek frames
featuring the Knock Block steering stop. Built in partnership with FSA, this 1-1/8" headset includes
precision bearings, compression spacers, crown race, and the unique Knock Block frame chip with
locating pin holes and bolt. With durable AL7075 alloy construction and an anodized black finish,
this headset ensures smooth steering performance while protecting your frame from handlebar and fork crown impacts.
Why you’ll like it
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Complete system – includes top cap, bearings, compression spacer, crown race, and Knock Block chip.
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58° AL7075 alloy top cap – strong, lightweight, and anodized black for durability.
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42E precision bearings – smooth, long-lasting performance.
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Knock Block frame chip – protects your frame by preventing handlebar over-rotation.
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FSA co-branded – trusted quality from a leading headset manufacturer.
What’s in the box
- 1 × AL7075 58° top cap (anodized black, FSA logo)
- 1 × Set of 42E sealed cartridge bearings
- 1 × Compression spacer
- 1 × Crown race
- 1 × Knock Block frame chip with locating pin holes and bolt
Tech specs
| Manufacturer |
Trek / FSA |
| Model |
Knock Block Headset |
| Size |
1-1/8" |
| Top Cap |
58° AL7075, anodized black |
| Bearings |
42E sealed cartridge |
| Included Hardware |
Compression spacer, crown race, Knock Block chip, locating pin, bolt |
| Finish |
Black anodized |
| Application |
Trek frames with Knock Block steering stop system |
Fit notes
- Designed for Trek bikes equipped with the Knock Block system.
- Includes all hardware for a complete installation.
- Protects frame from damage by preventing over-rotation of handlebars and fork crown contact.
