I cannot adjust the height of the handlebars on the 20" Mongoose
I unscrewed all of the hex nuts holding the handlebars to the stem and can adjust the angle of the handlebars.
I also unscrewed the nut on top of the stem (where one of the brake cables thread through) and managed to pop off the entire handlebar stem.
Once the stem was off, I did not see a traditional bar that raises and lowers. There was a hollowed out metal bar that the brake cable ran through, but I did not see any way to raise the metal bar to give the handle bars more height.
My son loves the bike but the handle bars are too low for him to truly ride it safely or effectively. Thanks for any help.
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I'm answering 7 years later. I have a Schwinn Varsity 2500 Bike made probably in 2015. The Schwinn Varsity Bike is not set up the same way as a traditional bike. I loosened the center compression bolt and the two side stem clamp bolts and it came loose where I can adjust it up or down but, there's nothing to tighten the slack up below. I did some research. My original post here was to add or remove a spacer. I think you can remove a spacer to lower but, I don't think the stem is long enough to add another one. I've seen they sell an extension that you can add-on to make the handle bars higher.
Depends on what style of handle bars you have or what you want to do. Do you want to change the handle bars? Change height?Change the angle or stem?
You need to know what kind of headset you have on your bike. Either you have a "Threadless" or a "Threaded" headset. A "Threadless" headset has a star nut wedged in the fork tube and a hex bolt that goes through a plug on the top of your stem down into the star nut to compress everything together. You can easily change stem angle, length and height with a new stem which is realitivly inexpensive. If you have a "Threaded" headset the riser tube and stem are all one piece and it has a split/bolt at the bottom of the riser bar. As you tighten the split/bolt it tries to seperate wedging itself in your fok tube making everything tight. Not as easy to change but just as inexpensive.
Either way or whatever you are doing to your bike you will need a good set of allen keys. Almost every bolt on a bike now is hex head so a set of allen keys is a must.
You have either a nut or a hex nut on the top of the post holding the bar to unscrew, then raise or lower the post to the desired height, then holding it in place, re-tighten the nut or hex nut.
That should be your answer :)
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 stem could be flipped over if the rise change would result in a hgiehr handlebar, but it would be minimal. That style of stem requires the steerer tube to be cut at the time of assembly and spacers are usually installed that would allow lowering the bars but not raising them since steerer tube length can't be increased.