20 Most Recent Mongoose MGX Maxim Dual Suspension Mountain Bicycle - Page 9 Questions & Answers

The first thing you need to do any chain work is a chain tool
This allows you to push a pin out to break the chain and then push the pin back in to lock it and then release the pin to allow the chain to bend. One of these is a must for any rider, cheao and could save your ride if a derailleur breaks or something.

It sounds like you need a set of METRIC allen wrenches. Then the 4mm one will fit. Rgds, Scott

Warranties may not cover that kind of damage but any bicycle shop can either lace a new rim on it or sell you a new wheel (probably cheaper).

You could use a search engine "adjust bicycle brakes" or start here...

http://www.parktool.com/blog/repair-help/categories/brake-service-and-repair

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 and least-invasive 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.

A reputable Bicycle Shop would have fit the bike to you before you took it home.

The crank or the bottom bracket.

Read whichever is applicable...

http://www.parktool.com/blog/repair-help

Web search "how to.. " for just about anything you need to know. Many videos out there.

The number of speeds is irrelevant and tells us nothing about the hub but the actual manufacturer and design of the hub are the determinants as there are variations. You could do some web searching for an answer. Shimano documents their components very well, for example.

Some good general resources...

http://sheldonbrown.com/k7.html

http://www.parktool.com/blog/repair-help/categories/hub-service

Web search "install brakes on bicycle"

Look here http://www.parktool.com/blog/repair-help/categories/brake-service-and-repair

Mongoose didn't make the chainring. They're generic (like most bike parts) and have many substitutes. Determine the parameters and then go looking for one that fits.

http://www.sheldonbrown.com/gloss_bo-z.html

Other parts may also be worn, like the chain.

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

It doesn't...
http://www.parktool.com/blog/repair-help/categories/chain-repair-and-service

But you CAN get a manually-removable SRAM Powerlink to make it easier next time.

http://sheldonbrown.com/chains.html

Make sure you get the right width.

Take this "how do i adjust the gears" to a standard search engine for instant video advice.

A simple web search for "how do you put on the front tire" yields many resources with video.

Sports Store? Do they also sell fishing tackle, skis and appliances? Take it back and buy a real bike at a real Bicycle Shop.

It will be fully functional and fitted to your son before you take it home and in a month or so they'll probably re-tune the shifting and everything for free.

If you can't find a nearby bicycle shop easily
http://www.kansascyclist.com/bikeshops/Nebraska.html
http://www.bicycleshops.us/regional/ne.htm

try the local cycling community...
http://www.kansascyclist.com/Nebraska.html
They'll know where the good shops are.

http://www.parktool.com/blog/repair-help/categories/crank-service

Or use a search engine and find videos.

Well if you mean what is twenty inch, its the wheel. The wheel diameter (from one point on the rim through the center and to the other side) is twenty inches.

I am not very familiar with pegs, but I presume that you just remove the bolts inside the pegs. Use a wrachet with an extension. The nut should be 5/8 inch, or in metric 15 mm. They are the same. The pegs should then slide off. Replace the nuts because they hold the wheels on. If I was wrong about something give your local bike shop a call and ask them for advice or even bring it to them.