Originally Posted by
techsensei
Your new stem is probably slightly shorter than the old stem. So when you tighten the top cap, it cannot pull up enough to tighten the bearing. You need to add another spacer underneath the stem so that the steerer tube is 3mm below the top of the stem.
What do u mean by slightly shorter? My old stem is 70mm and my new stem is 110mm. And do i must add another space underneath it? can i just put it above.