20'' Mongoose BMX - How can i adjust handlebar height?
The bike has a Aheadset stem assembly if that helps.Owner's manual does not talk about height adjustment only angle adjustment. I have loosen everything on the stem and handlebar and can't get it to come up. Whats the deal?
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Re: 20'' Mongoose BMX - How can i adjust handlebar...
Aheadset headsets and clamp on stems are set to the maximum height from the factory, they can't be raised any higher without buying a new fork with a longer steering tube. Some times there will be a couple of washers under the stem and above the upper bearing of the headset that can be removed so that the stem can be lowered. These types of stems typically have a cap that screws into a "star nut" inside the steering column with a #4 or #5 Allen head socket bolt, this is used to adjust the bearings. Remove this cap and bolt (don't mess with the star nut, it is press fit into place), next loosen the one or two bolts at the back of the stem (typically at the back of the stem but not always). Be careful when removing the stem because there won't be anything holding the fork in the bike frame and it can fall out on the floor if you aren't careful. You will also notice that the fork is real sloppy without the stem in place now.
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If your bike has a "threadless" stem (fig. 6) your dealer may be able to change handlebar height by moving height adjustment spacers from below the stem to above the stem, or vice versa. Otherwise, you'll have to get a stem of different length or rise. Consult your dealer. Do not attempt to do this yourself, as it requires special knowledge.
If your bike has a "quill" stem (fig. 7) you can ask your dealer to adjust the handlebar height a bit by adjusting stem height. A quill stem has an etched or stamped mark on its shaft which designates the stem's "Minimum Insertion" or "Maximum Extension". This mark must not be visible above the headset.
looking at some pictures of this model, most appear to be using an "Aheadset" style handlebar stem, there is not any way to raise this type of stem. Your alternative is to go online or to a local bike shop and purchase a new stem that will fit your fork and handlebar that has a higher pitch angle to it, or a compatible adjustable stem that pivots. Expect to pay $25-$50 or more for a new handlebar stem, not including labor to install.
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.
You can only raise a quill stem os far safely. Loosen the vertical center bolt that's in line with the steerer tube a few turns and then tap down on it with a block of wood or rubber mallet to unseat it. The stem should be loose enough to turn independently of the front wheel. You can also raise it somewhat, but look carefully for the "maximum height" or equivalent markings etched into the stem body. Don't expose any more stem than up to that line. Line up your handlebars with the front wheel and securely tighten that bolt. It should be tight enough to vigorously resist independent rotation when you hold the front wheel bewteen your knees and attempt to turn the handlebars.
If it's a new-style threadless type stem, the maximum height was determined when they assembled the bike because they had to cut the steerer tube to be below the top edge of the stem. Go to a Bike Shop and have them replace the stem with one that has a higher rise or shorter reach.
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.
The handlebars stem is an Aheadset-style and as such has spacers below it to set its height. Once the steerer tube is cut to fit the combination of stem and spacers there's no going UP, only down. Stems can be replaced with different rises and lengths. Maybe that would help. A Bicycle Shop would have everything you need and the know-how to decide if you can mount the child carrer.