KnockBlock 58-degree Headset Assembly 28.6mm (1-1/8") / 38.1mm (1-1/2") (Fuel EX 2019-21 etc)


Pay for your purchase in four interest-free installments (due every two weeks).

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Detail Information

Trek proprietary headset components compatible with Trek Knock Block models.

Genuine Trek replacement parts

Service and replacement parts specifically for Trek Knock Block Technology

Product details

  1. Trek proprietary headset components compatible with Trek KnockBlock models
  2. Includes crown race, bearings, top cover, frame chip and fastener
  3. KnockBlock headset spacers not included
  4. Must be paired with KnockBlock stem and KnockBlock spacers
  5. Compatible with all Trek KnockBlock models


Manufacturer part # IS-2-HBS/42/ACB
Steerer outer diameter 28.6mm (1-1/8") / 38.1mm (1-1/2")
Crown race inner diameter 39.8 mm
Cup Insertion OD Integrated
Stack height 8.7 mm
Bearing type Sealed
Headset type upper Unthreaded fully integrated
Headset type lower Fully integrated
Material Aluminium

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