Originally Posted by
2cam16
Stem spacers help in your fit on the bike. If your fit right now pre-threadless feels good, I suggest getting some measurements so you can transfer them over to your new cockpit set-up.
I don't understand. Aren't they just shims that go between the bottom of the stem and the locking nut of the headset? They don't change fit as that's determined by the length of the fork, or in my case, the length of the stem adapter.
I can see them providing some support to the bottom of the stem but I would think and hope that the 2 bolts on the back of the stem would provide all the necessary strength.