An essential Trek original part for clean, perfectly integrated steering. Ideal for a reliable replacement and a neat finish on your bike.
Sylvain C.
Mechanical expert
The Trek RCS System upper headset cap is a genuine Trek replacement part, designed to ensure a perfect fit and optimal performance of your headset. Compatible with 1-1/8" (28.6 mm) steerer tubes, it fits directly into the RCS headset system used on many recent Trek bikes.
This component allows for a clean and secure internal routing of brake hoses and cables, improving both the bike’s aesthetics and the protection of the cables. Essential when replacing or refurbishing your headset, it ensures precise alignment and a neat finish.
Ideal for maintaining the original performance and reliability of your Trek bike, this top cap guarantees perfect compatibility and a flawless installation.
- Compatibility: 28.6 mm (1-1/8") fork steerer tube – Trek RCS headset system
- Use: road / gravel / MTB depending on compatible Trek models
- Colour: Black
- Part number: 5328901
- Brand: Trek
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We value your opinion
Jean louis F. 
Not installed (Translated review)
Anne-Marie L. I have a doubt about the cover? (Translated review)
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