propagandrew

Why does the lip exist on the locknut of threaded headsets? Why would you not just have a stand nut threaded the entire way through, thereby allowing you to have any length fork steerer tube you want. It might look kind of stupid to see threads coming out the head tube of a bike, but what purpose does the lip of the locknut serve? Below is a link to the parktool website showing exactly the part i mean.

https://www.parktool.com/images/repair_help/fork22.jpg

Thanks for any info, just curious.

bostontrevor

You still can run any length steerer you want. Just put in some washers between the race and locknut.

propagandrew

True, but to specifically fabricate a locknut with that lip seems there's some purpose to having it there. Otherwise why not just use off the shelf standard nut.

Coda1

I am guessing it is to protect the threads from damage and dirt.

bostontrevor

Yeah, in fact you can even get (and many headsets come with) a seal that sits under the top of the nut and forms a tight fit with the steam to keep out water.

sydney

Think about where the threads are and where the locknut is....I have locknuts without the lip and without it there is a big gap between the stem and nut. It helps center and provides a little support for the upper part of the stem..... and looks better.