Height and angle of the handlebars
If your bicycle is equipped with threadless handlebar stem, the handlebar height should set by your dealer. For other bicycle types, you can also adjust the height of the handlebars yourself. Turn the locknut on the headset clockwise three or four times. If the bolt moves upwards but the handlebar stem cannot yet be removed, strike the locknut with a wooden mallet. Adjust the handlebar stem to your needs and realign it to the front wheel, making sure the maximum height marker is not visible. Tighten the locknut again until the handlebars can no longer be turned independently of the front wheel. Ensure that the handlebars can be freely turned in both directions without the brake cables making contact with or tangling with any other parts of the bike.
Changing the handlebar height on some bicycles may effect the function of front brakes. If the brakes are not working properly, ask your dealer to adjust them. After setting the handlebars and stem, always double check that both are firmly secured.