What You Need Before You Start
You need a bicycle pump and nothing else. The pump must match your valve type — most modern bikes use either Presta (thin, with a small locking collar) or Schrader (thick, like a car tire valve). Check which one your bike has by looking at the valve stem on your wheel rim. Some pumps work with both types; others fit only one.
A floor pump (the tall kind that stands on the ground) is easiest for home use because it has a large barrel and a handle you can push with your body weight. A hand pump or portable pump works when you are away from home, though it takes more effort. A CO2 cartridge inflator is fastest but runs out after a few uses and costs money to replace.
You do not need a pressure gauge if your pump has one built in — many floor pumps do. If it does not, you can buy a separate gauge for a few dollars, or you can learn to feel when the tire is firm enough by squeezing it with your hand.
Key Takeaways
- Check your valve type (Presta or Schrader) before buying a pump, because not all pumps fit all valves.
- Remove the valve cap, open the Presta valve collar if you have one, and push the pump head straight onto the valve until it seats firmly.
- Pump until the tire reaches the pressure printed on the tire sidewall, which is usually between 30 and 100 PSI depending on the bike type.
- Remove the pump head straight off the valve, replace the valve cap, and check the tire firmness by squeezing it with your hand.
- Pump your tires once a month or whenever they feel soft, because all tires lose air slowly over time.
Identifying Your Valve Type and Pump
Look at the valve stem sticking out of your wheel rim. A Presta valve is thin and has a small metal collar at the top that you twist to open and close. A Schrader valve is wider and looks like the valve on a car or truck tire — it has a spring-loaded pin in the center and no collar to twist.
Check your pump head. Most floor pumps have a lever or switch that lets you flip between Presta and Schrader, or they have two separate heads. Hand pumps and portable pumps often fit only one type. If you are not sure, take a photo of your valve and show it to the bike shop staff when you buy a pump — they will tell you which one you need.
If you already own a pump and do not know which type it fits, try pushing it gently onto the valve. It should slide on smoothly. If it does not fit, you have the wrong type.
Removing the Valve Cap and Opening the Valve
Unscrew the small plastic or metal cap on top of the valve and set it somewhere you will not lose it. For a Schrader valve, you are done — the valve is already open. For a Presta valve, twist the small metal collar at the very top counterclockwise (lefty-loosey) until it stops. Do not force it; it only needs to turn a quarter turn or so.
If you have a Presta valve, you may see a tiny bit of air escape when you open the collar. This is normal. The collar is just a lock to keep the valve closed during storage and shipping.
Do not remove the valve stem itself. You are only opening the valve so air can flow in.
Attaching the Pump and Inflating
Push the pump head straight onto the valve. It should slide on smoothly and seat firmly — you should feel it click or lock into place, depending on your pump design. If it does not feel tight, remove it and try again. A loose connection will let air escape around the sides instead of going into the tire.
Once the pump head is seated, begin pumping. Use smooth, steady strokes. On a floor pump, push the handle down with your body weight, then pull it back up. On a hand pump, push and pull the barrel. Watch the pressure gauge on the pump (if it has one) as you go.
Stop when the pressure reaches the number printed on the tire sidewall. This number is usually between 30 PSI for a wide, soft tire and 100 PSI for a thin, hard road bike tire. If you do not have a gauge, squeeze the tire with your hand — it should feel firm but not rock-hard. You should be able to press your thumb into it slightly, but it should push back.
Removing the Pump and Checking Your Work
Pull the pump head straight off the valve. Do this quickly and smoothly — if you twist or angle it, you may damage the valve. A small amount of air may escape when you disconnect; this is normal.
For a Presta valve, twist the collar clockwise (righty-tighty) to close it again. Replace the valve cap on both types. The cap keeps dirt and water out of the valve.
Squeeze the tire with your hand to double-check the firmness. It should feel similar to the other tire on your bike. If one tire feels noticeably softer, pump it a bit more. If it feels rock-hard, you may have overfilled it — let a tiny bit of air out by pressing the valve pin (Schrader) or opening the collar and pressing the stem (Presta).
How Often to Pump Your Tires
Check your tire pressure once a month, or whenever the tire feels soft when you squeeze it. All tires lose air slowly over time, even if there is no puncture. Road bike tires (thin and high-pressure) lose air faster than mountain bike tires (wide and low-pressure), so you may need to pump road tires every two to four weeks.
If a tire loses air much faster than that — going flat in a few days — you likely have a puncture. Look for a thorn, glass, or sharp object stuck in the tire, or feel around the rim for a hole. If you find a puncture, you will need to patch the inner tube or replace it.
Pumping your tires regularly keeps them at the right pressure, which makes your bike easier to pedal, gives you better traction, and protects the rim from damage if you hit a pothole.
Troubleshooting Common Problems
If the pump head will not stay on the valve, the connection is not tight enough. Remove it and try again, pushing straight in and making sure you hear or feel it lock. If it still will not stay, you may have the wrong pump type for your valve.
If air leaks out around the pump head while you are pumping, the head is not seated properly. Stop, remove the pump, and reattach it. Make sure you are pushing straight in, not at an angle.
If the pump is very hard to push, you may have reached the target pressure — check the gauge. If the gauge shows you are still below the target but the pump is hard to use, the pump may be worn out or the seal may be damaged. A hand pump becomes harder to use as the tire fills because you are compressing air into an increasingly full space; this is normal.
If you pump the tire but it goes flat again within a few hours, check for a puncture or a leaking valve. A Presta valve that is not fully closed will leak slowly. Make sure the collar is twisted all the way clockwise.
Frequently Asked Questions
Can I use a car tire pump on my bicycle?
Only if your bike has a Schrader valve, which looks like a car tire valve. If you have a Presta valve, a car pump will not fit. Even with a Schrader valve, a car pump is usually too powerful and can overinflate a bicycle tire in seconds, so use it carefully and watch the pressure closely.
What happens if I pump the tire too hard?
An overinflated tire can burst, especially if you hit a pothole or curb. The tire will also feel harsh and uncomfortable to ride on. If you overfill, let air out by pressing the valve pin (Schrader) or opening the Presta collar and pressing the stem until air escapes. Check the pressure again with your hand or gauge.
How do I know if my tire pressure is too low?
The tire will feel soft and squishy when you squeeze it. The bike will be harder to pedal, and the tire may bulge out at the sides. Riding on a very soft tire can damage the rim and inner tube. Pump it up to the pressure printed on the tire sidewall.
Do I need to remove the wheel to pump the tire?
No. You can pump the tire while the wheel is on the bike. Just make sure the valve is accessible and you can push the pump head on straight. Some bikes have fenders or frame geometry that makes it awkward, but it is still possible.
Why does my tire lose air even though there is no hole?
All tires lose air slowly through the rubber and the valve seal. This is normal. Road tires lose air faster than mountain tires because they run at higher pressure. Pump your tires once a month to keep them at the right pressure.