So I have this bmx bike where the back tire's inner tube was leaking air and I'd have to inflate it every day or so. And I just got a new tube and it's having the same issue. Anyone got any ideas?

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    If the air is coming out of the tube, its exiting through either a hole, or a weakness in the valve. Use the dunk test on the tube to find the hole and then patch it. Then search the tyre/rim for the cause. – Criggie Mar 28 '17 at 10:18

Any time you replace a tube you should run your hands along the inside wall of the tire carefully. You'll be able to feel if there is a thorn or other sharp object that is puncturing your tubes as fast as you can replace them.

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