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

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$105.99

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

Trek proprietary headset components compatible with Trek Knock Block models.

Service and replacement parts specifically for Trek Knock Block Technology

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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Specifications