i bought a used frameset awhile back, and the PO cut the steerer super short, and put a really low profile headset on it for a really slammed look.

under heavy braking sometimes I can feel the headset move and knock.

I already have the star-nut preloader thingy super snug, but I think the headset is either poorly designed or missing a part ( no name headset )


Any ideas on what I could do to help, or any suggestions for a super low profile non threaded headset?

I would first take apart the current headset, clean it up and examine for condition and having all the parts, like the compression ring that centers the slide on upper bearing surface. Some headsets are very sensitive to minute adjustments (like those with tiny ball diameters). Sometimes this compressing ring is left out. Sometimes the steerer is worn or roughened where the CR sits and hinders the proper function of the CR. Sometimes bearings are installed upside down. Sometimes bearing surfaces are so worn that no amount of cleaning and fresh lube will make then work well. And the list goes on.


The answer is in front of you, not us. You need to do more discovery with the actual headset then get back to us if you still have questions. Or take the bike to your LBS... Andy.

Are you sure? Is the top cap resting on the steerer tube or the stem? The stem should be higher then the steerer tube for the 'preloader thingy' to work. Was the preload set before them stem was clamped tight to the steerer tube. It can be set as tight as can be, but the preload has to be set before the stem is clamped to the steerer tube.

I'd begin by squeezing the front brake closed and rocking the bike back and forth a bit. Watch and FEEL for any movement, and where it is occurring. If that doesn't help then start taking things apart.

Good Luck