if so, spacers should be on the right spot and the pinch botls should be tights. top cap should not be moveable and this will make sure your front end turns lightly. apply light axle grease to make it smooth.
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There are two sets of bolts here. The first one is straight up and down, is probably the one that takes and Allen wrench and is the one that tightens the handlebar stem - that's the pipe that goes down into the frae toward the front wheel. At the bottom of that bolt (inside the bike frame where you cannot see it) is a wedge-shaped nut that wedges the stem tight. If the stem is loose, then you will be able to stand in front of the bike with the front wheel between your knees and turn the handlebars side to side, and if it is loose enough you will be able to pull the whole stem right out of the bike. On the other hand, maybe you mean that the handlebars twisted down (so that the ends of the handlebars are pointed toward the ground - this would mean that the other bolt or set of bolts are loose. Some bikes have one bolt that clamps the top of the stem around the handlebars, and some have 4 smaller screws that do this. If this is where the problem is, then no, you don't need to buy the Allen wrench, but it sounds like you might need a bolt.
To raise or lower the handlebars, first loosen the hex screw on the top of the stem. One or two turns is all that will be necessary. Next, you will need to stand in front of the bike with the front wheel between your legs to brace it, and give the handlebars a forceful twist to the left or right. This action will break the friction of the handlebar stem and the headtube (the headtube is part of the frame where the front forks and the handlebar stem meet...). With the handlebars loosened you can adjust the handlbars up or down. Keep in mind that the stem has only a specific amount of adjustment available...there is a limit to how far it can be extended up, as indicated by a line marked on the stem shaft. Once adjusted to the desired height, check that the handlebars and front fork and wheel are aligned. Tighten the screw in the top of the stem and you're done!
There's a ring nut between the stem of the handlebars (The stem is the vertical part of the handlebars) and the frame of the bike where the handlebars connect into the frame. The handlebar stem goes down through the ring nut into the frame.
Loosen the ring nut and you'll be able to raise the handlebars. There's a mark on the handlebar stem which indicates the highest point that the handlebars can be raised to. If you raise it above this there won't be enough of it in the frame and this can cause the stem to break when pressure comes on it. Also when tightening the ring nut up again make sure you have the handlebars and front wheel lined up.
Loosen both nuts on front wheel. Stand bike straight up, or set bike upside down on seat and handlebars. With fingers on fork and thumb on wheel, pull wheel so it is centered on fork.
Now tighten one nut part way. Keep holding wheel. You may need somebody to help. Then tighten other nut. Go back to fist nut and tighten a bit more. Repeat back and forth tightening until nuts are tight and wheel is in center of fork.
If you just need to raise the height of the stem, all you need to do is loosen the hex nut at the top of the handlebar stem with a box wrench or adjustable wrench. This is the head of the stem bolt. Once loosened enough the stem should slide up and completely out (if necessary) of the stem casing. There is a tightening mechanism consisting of two soft metal pieces that tighten against each other when the stem bolt is tightened. When this is loose you can raise the stem to various heights. If you find you cannot raise it to your desired height you may need to replace the stem and bolt. However, if the bike has been sized properly to fit your leg length, you should have no problem there. Once the height of the stem is satisfactory just tighten the bolt while keeping the stem straight and you'll be ready to go!
You haven't given me much to go on, but a common problem is to mis-identify where to tighten. There is a large nut (about 1-1/4 inch) that is the locking nut for the headset (which is where the bearings are that allow the fork to turn and steer the bike). This large nut does not tighten the handlebars. Rather, there is a long bolt that travels straight down through the handlebar stem. The handlebar stem is the bar that clamps to the middle of the handlebars and extends vertically down into the headset. At the bottom of the bolt (where you cannot see it) there is a wedge shaped nut. When you tighten this bolt the wedge nut jams itself inside the tube which is the top of the forks inside the headset, thereby locking the handlebar stem to the the forks. The head of the bolt you need to tighten can have a variety of shapes - could be an ordinary hex head, or it may require an Allen wrench (hex key). There are lots of different styles, but if you Google images of "handlebar stem" you will get the idea.
The center bolt on the stem tightens an expander wedge down inside the steerer tube. Loosen it a few turns, tap down on it to dislodge the wedge and the whole assembly should rotate independently of the wheen and you should be able to move it vertically.
The stem can only be safely raised so far. There will be a 'minimum insertion ' mark etched on it. Don't go any higher than that or you may die when the stem suddenly pops off the bike while you're riding it.
Get it to the height you want, align the handlebars square with the front wheel and tighten the bolt. While holding the front wheel between your knees, try to rotate the handlebars to make sure they're locked to the steerer tube.
If you need more height the stem would have to be replaced with one having a higher rise, shorter reach or some combination. A bike shop will have what you need.
First, support the bike so that the front wheel is off the ground. Then, loosen (do not remove, just loosen them) the bolts that clamp the fork tubes into the upper and lower triple clamp braces. Loosen the front axle attachments to the fork legs. Now stand in front of the bike and hold the front wheel between your knees and turn the handlebars until they are straight - and re-tighten everything. Also, check the large nut on top of the steering stem, making sure it is tight.