Do you know how to fix my brothers' bike?

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I like the........

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So my little 9 year old has his bike and every 2 weeks or so his back tire keeps on moving to the side and his chains always pop because of too much oil he says that he wants a new bike but we can't buy him one right now so is there anyway how to fix it from happening again?
 
Get your Dad to look at it.

Try this.
http://www.parktool.com/repair/readhowto.asp?id=27
 
I've been working on bikes for about 3 years and i've heard this problem a million times. The chain is too loose The solution is loosen the axle nuts with the appropriate size ratchet or wrench. Second, Pull back the tire until your chain is at the desired tension. Not too loose not too tight. Lastly while pulling back your your rim tighten down the axle nuts. Make sure that the rim is centered. If you do not have the proper tools or are having trouble doing so bring your son's bike to your local bike shop. This is a very simple fix. I wouldn't be surprised if the repair took 2 minutes and was fixed for free.
 
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