Headset types.

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Wire headset.

Conventional and “ordinary” bicycle use most.
This headset is distinguished from all other systems by
confirmation with the headset bolts on the fork (with
thread). Most common sizes are 1 “and 1 1/8”.
Associated control pins have an outer diameter of
22.2mm and 25.4mm.
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Ahead headset.

Like a traditional headset, it uses two sets of bearings and bearing cups.
Unlike a threaded headset, a threadless headset does not have a threaded top headset race or use a threaded steerer tube.
Instead the steerer tube extends from the fork all the way through the head tube and above the headset,
and is held in place by the stem clamped on top.
The advantage is quick installation and adjustment with only an Allen key,
but the downside is that the stem can not simply be higher or lower.

.
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Low profile headset.

The cups have a standard outer diameter of 44mm
A number of other names which are also used for this system:
“Zero Stack”, “Integrated with Cups”, “Internal Headset”
“Semi-Integrated”

The adjustment of the headset is equal to the Ahead headset
performance.

.

Perdido headset.

The Perdido® headset is a kind of low profile type, but uses
odd sizes. The outer diameter of the cup is 44.5mm and
the recommended inner diameter of the frame is 44.4mm
Perdido® is a registered trademark of Chris King®
Company.

The adjustment of the headset is equal to the Ahead headset
performance.

.

Integrated headset (without cups)

A relatively recent development, integrated headsets do away with the upper and lower bearing cups
on threadless headsets and instead seat the bearings directly against the head tube of the frame.

“IS” system: the bearings for 1 1/8 frame tube have a
outer diameter of 41mm and a 45 degree contact point with the
frame. The bearing can be referred to as 36-45 (36 is the
inside diameter, the point of contact with the cone and 45 stands for
the contact point / angle to the frame.
A less common model of this system has a 36
degree angle, and an outside diameter of the bearing of 41.5mm.
This may be referred to as lower 36-36.

The adjustment of the headset is equal to the Ahead headset
performance.

Columbus headset

Colombus headset uses a cartridge bearing cup which
is pressed into the frame. The narrow section of the cup falls in
the frame (39.9mm) and the wide portion must be the same
outside diameter as the frame (45mm). The bearings with a
36 degrees angle normally have an outer diameter
of 41.5mm.

This headset is not compatible with other systems. Often
the cups are sprayed in with the color of the frame to make them
leave less noticeable. The bearings are in this system slightly
more outside the frame, through the special high cups.
The adjustment of the headset is equal to the Ahead headset
performance.

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