Put an inner tube in (please noted that the new inner tube should be inflated with a little bit air to keep a tubular shape before it is installed).
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Please make sure that the whole inner tube is installed evenly without any protrusion.
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Start from the valve and put the left side of the tire into the wheel rim with your thumb, and you may also use the tire lever to put the tire back.
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When both the inner tube and the tire have been installed in the rim, inflate the inner tube with 10PSI air and then check whether the inner tube has been locked in the rim properly and, if so, continue to inflate the inner tube to the standard pressure.
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