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I have just bought a mongoose pro g 2 bike second hand and was having problems tightening the handlebars, they were a bit loose. I have replaced the star nut and still it will not tighten correctly, why?

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THE HANDLE BARS SOUND LIKE THEY ARE THE WRONG CIRCUMFRANCE

Posted on Sep 14, 2010

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1 Answer

Raise the handle bars on my new mongoose bike


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The stem is loose when im riding but i tightend the L key on the top tight as possible n neck still loost any idea?


There are typically two allen bolts that mount on the side of the handlebar stem. Those should be tightened. The top one should only be tightened to remove up and down play in the headset. If you tighten the top one too tight, steering will feel clunky. Only tighten the top one tight enough to remove the up/down play. Use the side bolts to keep the handlebars from turning relative to the wheel.

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Just bought a Mongoose Spear (26"). How do I raise the handlebars?


http://www.sheldonbrown.com/handsup.html

Getting Riser Bars or simply flipping the stem over or getting one with a different rise and reach might give you the added height you need. If you LIKE the handlebars, the stem is the best option as most new ones come with front loaders (detachable front caps) that allow replacement without stripping components off one side of the handlebar. In minutes a Bicycle Shop could swap any number of them onto your bike for you to try.

I would recommend you get used to the position that yields a careful compromise between aerodynamics and uprightness when needed.

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I can't get the handlebars to lock in to the forks, any ideas?


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. good luck. Al K

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1 Answer

Front forks loose


Without more info, I can't tell if you mean you have a loose head-set (that's the vertical tube that holds the bearings that turn when you steer), or if you have a mountain bike with springy front forks and the springy part is loose. If it's the springy part, you'll probably have to replace the whole front fork. If's it just a loose headset, you can tighten it pretty easily. Look at the top of the headset while you turn the handlebars back and forth (as if steering). Looking at the top of the headset you will see (from bottom to top) a knurled ring, a washer, and a large nut. The nut is a lock-not which is isolated from the knurled ring by the washer. The washer has a tab on the inside that prevents it from rotating. Tighten up the knurled ring by hand (you might have to lift up on the handlebars a bit to take the pressure off of it). Don't over-tighten the knurled ring or you won't be able to steer. Then tighten the lock nut with a wrench. Good luck

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1 Answer

Loose handlebars on a Mongoose XR-75 mountain bike. I tried to tighten them but they still are loose. Help!


Check the splines on the handle bar. Just loosen the "clamp" and slide the bar over to one side enough so you can tell if the are stripped or not. If they are then replace the bar, if not then reassemble and try to put a littlle extra torque on the bolt.

I have noticed with the 2 of these bikes that I have that the bars do not like to stay tight for long, they tend to work thier way loose about every other time we use them. I just keep tightening them untill the splines strip, then pick up a new bar.

Contact Mongoose for parts info at: www.Mongoose.com under "about" click ask mongoose.

Good luck.

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Mongoose Handlebar adjustment


where the bars slide into forks there should be a allen nut on the top undo this slightly and adjust bar height then tighten up allen nut

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1 Answer

How do I raise handlebar


usual is the undo the alan key or imbus key bolt in the middle of the handlebar stem. only undo this a couple of turns until the handle bars can move from side to side if you undo too much the locking sears inside the stem may fall off into the folks and are difficult to retreived and reset back onto to your stem. and its usually a dirty job.

Once your handlebars are loose pull up to desired level and retighten.
best way is to stand with the front wheel griped between the legs facing backward between the handlebars lifting up with a left to right rocking motion on the bars. Do not over tighten as this may cause the stem to bond inside the forks and not release in years to come.
it is usual that a bit of grease is in this area to stop the metals bonding inside each other.

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2 Answers

Handlebars loose


Construct shims from aluminum (soda / cola) cans with scissors. Be careful not to cut yourself, sheared aluminum is very sharp. After you have cut a wide strip of aluminum, wrap it around the handlebar and put it between the handlebar and the clamps. This will increase the diameter of the handlebar and allow your clips to exert more pressure on the handlebars making them tighter. Try not to leave any aluminum exposed after fixing it; it's sharp.

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