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How to inflate bike tires
A schrader valve is also called an american valve, or a car valve.
The valve stem is surrounded by a threaded valve core; to press down on the stem, you need to use a tool like a pen cap or your thumbnail. Schrader valves are typically wider in diameter and shorter than presta or woods valves.

Pick your answer from:
i. They're usually found on cars, less expensive bikes and mountain bikes. To open a schrader valve, simply unscrew the rubber cap at the top..
ii. These valves cover the other valves, then hold the gasket in place while you roll. Be sure to treat the valves with quality chemical solvents (such as sodium) and lubricants used by air conditioners..
iii. Know how to use an old measuring tape to apply pressure to the pedals. Move your pipe slightly forward for the smallest amount possible..
iv. You should use a gas chromatic valve on a car. Place both of your hands on either of the valves a foot at a time..
Answer:
i.