How to Inflate Bike Tires

Inflating your bike tires is a simple and painless task, as long as you know what tools you need. Identify your valve type with the methods below and pump accordingly.

Method 1

Method 1 of 3:

Schrader Valve

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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.^{[1]XResearch source} Schrader valves are typically wider in diameter and shorter than Presta or Woods valves. 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.
This is usually on raised print on the side of your bike tires and will consist of a range. Don't let your PSI go any lower than the lowest number; the high number is the recommended maximum PSI.
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3
Locate a pump. If you don't already have one, try to use a gas station pump, or borrow one from a friend.
- If you have a Schrader valve, you're in luck - you won't need an adapter to use a gas station pump. Ask the attendant for a pressure gauge and inflate your tires in small bursts, checking the pressure after each one. Gas station pumps are extremely high pressure, and you can pop your tires if you're not careful.
- If you're using a bicycle pump with two openings, the larger one is meant for the Schrader valve.
- Smart pumps with one opening will automatically adjust to accommodate a Schrader valve.^{[2]XResearch source}
- A pump with one opening may require you to reverse an internal rubber stop to fit a Schrader valve. Unscrew the face cap and find the rubber stop. The larger end should be facing out for a Schrader valve.
4
Inflate the tire. Unscrew the rubber cap on top of the valve and put it somewhere safe, like your back pocket. You don't want to lose it.
- Put the pump on the valve. If there's a lever near the nozzle, make sure it's in the open position (parallel to the nozzle) when you're putting it on the valve; snap the lever down into the closed position (perpendicular to the nozzle) when it's on. Keep an eye on the PSI as you pump.
- Flip the lever back up to remove the pump, then quickly return the rubber cap to the valve.
To deflate a tire with a Schrader valve, simply press on the springy valve stem with a fingernail or other small tool until all the air escapes.^{[3]XResearch source}

Method 2

Method 2 of 3:

Presta Valve

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Presta valves are longer and narrower in diameter than Schrader valves, and feature an external valve stem that is protected by a valve cap, instead of being surrounded by a valve core.^{[4]XResearch source}
To open a Presta valve, unscrew the dust cap at the top and put it somewhere safe. Then, loosen the small brass cap on the valve stem - it won't come off completely, but you should be able to raise it a bit. To check if you've loosened the bras cap enough, press on the valve stem. If you can hear air escaping in a sharp burst, you've loosened it enough.
This is usually on raised print on the side of your bike tires and will consist of a range. Don't let your PSI go any lower than the lowest number; the high number is the recommended maximum PSI.
4
Locate a pump. Try to use a gas station pump, or borrow one from a friend. You can also purchase pumps at your local cycle shop.
- To use a gas station pump on a Presta valve, you'll need a Presta adapter. This is a small cap you can screw onto a Presta valve to essentially turn it into a Schrader valve.^{[5]XResearch source} Some older bike pumps might also require you to have a Presta adapter. You can purchase one from your local cycle shop. When using a gas station pump, ask the attendant for a pressure gauge and inflate your tires in small bursts, checking the pressure after each one. Gas station pumps are extremely high pressure, and you can pop your tires if you're not careful.
- If you're using a bike pump with two openings, the smaller one is for a Presta valve.
- Smart pumps with one opening will automatically adjust to accommodate a Presta valve.
- A pump with one opening may require you to reverse an internal rubber stop to fit a Presta valve. Unscrew the face cap and find the rubber stop. The smaller end should be facing out for a Presta valve.
5
Inflate the tire. Open the Presta valve by unscrewing the dust cap and loosening the smaller brass cap.
- Put the pump on the valve. If there's a lever near the nozzle, make sure it's in the open position (parallel to the nozzle) when you're putting it on the valve; snap the lever down into the closed position (perpendicular to the nozzle) when it's on. Keep an eye on the PSI as you pump.
- Flip the lever back up to remove the pump, and screw the brass cap closed.
- Replace the dust cap.

Method 3

Method 3 of 3:

Woods Valve

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It is larger like a Schrader valve, but employs the same mechanism as a Presta valve. Refer to the Presta valve section for instructions on how to inflate a tire with a Woods valve.^{[6]XResearch source}

Community Q&A

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Question
How do I know when I have pumped enough air into the tire?
Community Answer
The tire should feel firm - you shouldn't be able to pinch the sidewalls of the tire together very much. On a mountain bike tire, you should be able to push in by about a centimeter or so. Check the sidewall of the tire to find the minimum and maximum pressure values and use the gauge to get the pressure between these values.
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Question
How do you pump up a tire on the road?
Community Answer
Don't. You will be hit by a car. Pull to the side of the road and then follow the steps shown here. You don't need to know the exact pressure recommended for your tires. Just press down on the tire with your finger and pump until it feels firm, but with a little give left in it.
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What happens if I pump my tire up too much?
Community Answer
Should you pump the inner tube up too much, it will likely explode inside the tire. Check the sidewall of the tire to find the minimum and maximum pressure it can handle.
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Tips

If you're unsure about how much air should be put in or you don't have a pressure indicator on your pump, just fill the tires until they are firm, yet so you can still squeeze them ever so slightly. If you think it's done, you're probably right.^{[7]XResearch source}
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If you buy a pump, get one that makes sense for you. Many are the stand-up variety, where you stand on part while the handle goes up and down. Others are more compact--"mini" according to a number of companies' labels--which can be handy when you are on the go.
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Keep track of your valve caps. If you lose them, the valves can get dirty, leading to pumping difficulties, and will lose air more quickly.
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