bike tire losing air?

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H!-T3k

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i have a bmx bike and the back tire was missed up so was the tube. i replaced it with a new tire and tube, as i got on my bike and start pedaling the tire got flat so i put back some air in it again, but the tire still flatting down

whys this happening ?
 
if you got a new tire and tube then either your installation technique is bad, or your rim has a sharp edge on the inside, or your just unlucky and keep running over things you shouldnt.
 
If you replaced both the tube and tire at the same time, then it could be the rim strip. Take the tire and tube off and check the rim. There should be a strip of rubber, cloth or plastic that covers up the holes the spokes attach to. Sometimes that strip gets shoved to the side and a sharp part of the spoke or rim will puncture the tube.

Also whenever you change a tube be sure to check to see if something is poking through the tire. If there's a thorn barely poking through, it'll just put a hole in your new tube.
 
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