Not finding the right tension for my threadless headset I recently installed a new fork on a bike I'm building up. I find that before I get the preload tension correct on the top cap to remove knocking, a squeaking sound starts emanating from the steer tube area when I turn the handlebars.

I am going to disassemble the whole stack tomorrow and make sure that everything is on in the right order and that nothing that shouldn't be there is present.

FYI I put the crown race on and installed all the bits of the headset and everything looks fine. Does anyone have any experience in what might be causing such a noise?

If it makes any difference, I'm using a carbon steer tube and a "problem solvers" expansion plug.
I figured out what was causing the problem. I had used the compression ring in the place of the crown race. I did this because I lost the crown race and the compression ring looks similar.

FYI crown races for threadless headsets aren't standard, if you need to replace one you have to get one that matches your make and model.