TrackHead is replaced by head set star-nut in steerer tube. Inner diameters, or profile of for Steerer tube must comply with TrackHead outer diameters. TrackHead compatibility is dependent on
inner diameter/length tube profile,
not on bearings, or variation of head-set standards. TrackHead supports 2 variants of fitting mechanizm.
Most cases is used carbon head tube fork, without access from bottom.
This case is used special adapter for compression fit.
What is a threadless / A-headset?
The threadless headset is a much simpler and arguably superior design. It’s quicker and easier to service, which can be done with standard tools – hex or Torx keys in most cases.
As with the threaded headset, bearings are fitted at the top and bottom of the head tube. A crown race sits at the bottom of the steerer tube and mates with the lower bearings.
But, unlike the threaded design, the fork is not captive to the headset and is only held in place by a stem clamped to the steerer extending through the head tube.
The stem is clamped to the outside of the steerer tube, and its height can be adjusted with spacers.
Before tightening the stem, preload must be applied through the top cap, with a bolt that ‘pulls’ on a star nut or bung fixed inside the steerer tube.
Star nuts are only really used with metal steerer tubes. The two rows of ‘star-shaped’ teeth are curved so they bend back when pressed into the steerer, but bite into place when a preload is applied, pulling against the direction of the teeth.
The stem is clamped to the outside of the steerer tube, and its height can be adjusted with spacers.
Before tightening the stem, preload must be applied through the top cap, with a bolt that ‘pulls’ on a star nut or bung fixed inside the steerer tube.
Star nuts are only really used with metal steerer tubes. The two rows of ‘star-shaped’ teeth are curved so they bend back when pressed into the steerer, but bite into place when a preload is applied, pulling against the direction of the teeth.
