My car tire is flat

My Tires Have No Holes—So Why Are They Going Flat?
September 19, 2015 – 08:27 am
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I just got new tires a few months ago, but since then one of them has been going flat regularly. I had that one checked out where I bought the tires, and there aren't any holes in it, so I'm perplexed. How does a tire with no leaks go flat?

This sounds like a riddle: How can a tire with no holes go flat? By not leaking through the tire, of course. Just because the tire itself is fine doesn't mean there aren't other avenues for air to escape. Two prominent possibilities are the valve stem and the wheel on which the tire is mounted. Usually, a new set of tires includes new valve stems, since they can go bad through use and from exposure to road chemicals. If a valve is bad you'll have a constant and very slow leak through the base or the valve body. The other possibility is that the mounting surface of the wheel where the bead of the tire seats has become damaged by corrosion or dented from hitting a pothole. To see where the problem is coming from, fully inflate the tire and dribble a mixture of dishwashing liquid and water onto the valve stem, around its base, and around the inside and outside edge of the wheel where the tire and rim meet. Any escaping air will produce bubbles in the soapy water at the site of the leak. Then you can take the tire to the shop where you purchased it (which is where this leak should have been diagnosed in the first place), knowing exactly what and where the problem is.

Source: www.popularmechanics.com
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Popular Q&A
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Why does my car tire go flat every day even when I pump air every day? | Yahoo Answers

Bring it to a tire repair. You have a slow leak and it can be from the rim or you can have a nail in your tire that is unnoticeable. The problem should cost more that $20 to fix and that's over estimating

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