Originally Posted by
Chuckles1
Sorry, fifteen years or more since mechanics input. Memory not that good. What are threads on steerer tube for? I thought the threaded headset wedged against inside of steerer tube, essentially doing what the stem clamps do on threadless, that is holding the steerer tube so there's no play at races/ bearings.
The stem is not involved in headset adjustment on a threaded headset - the threaded locknut does that and the stem has a wedge or expander to grip the inside of the fork's steerer tube.
On a threadless headset the stem holds the bearing adjustment in place.