1 products in this category
Semi-Internal Headsets with 9.5 mm Stack
98 grams and a 44 mm cup for head tubes machined to take it.
The range
Every Semi-Internal Headsets Product
What This Category Is For
A semi-internal threadless headset machined from 6061AL-T6 with two sealed cartridge bearings, weighing 98 grams and adding only 9.5 mm of stack. The 44 mm cup seats inside a head tube that has been machined for it.
The Problem It Solves
Frame designers who want control over front-end height cannot get it with an external cup headset, which adds 33 mm of stack before the stem is even fitted.
- Frame designers specifying a low stack front end
- Brands building modern frames
- Workshops replacing semi-internal headsets
Who buys this range
Industries We Supply From This Category
Related reading
Guides for This Category
Buying Guide
Choosing a Bike Headset External or Semi-Internal
The frame decides, not the rider. A 33 mm stack against a 9.5 mm stack, and what happens if you specify the...
Read the guideProduct Guide
Sealed Cartridge Bearings and Why Pawl Count Matters
Two bearings, four bearings, six pawls. What those numbers on a hub or headset specification are actually...
Read the guideFAQ
Semi-Internal Headsets Questions
Will this fit a plain head tube?
No. The 44 mm cup needs a head tube bore machined to accept it.
How much stack does it add?
9.5 mm, split 7.5 mm upper and 2 mm lower.
Is this the same as an integrated headset?
No. Semi-internal still uses a pressed cup; integrated drops the bearing straight into the frame.
What colours?
Anodised red, gold, titanium, blue and black.
Quote the Semi-Internal Headsets Range
Send the models and quantities you need. Customised logo is accepted across the range.