You need a tire lever, a pump, and a replacement tube
Changing an inner tube takes about ten minutes once you have the right tools. You will need a tire lever (a flat plastic or metal tool that pries the tire away from the rim), a bicycle pump, and a replacement inner tube that matches your wheel size. The wheel size is printed on the side of your tire — common sizes are 700c for road bikes, 26 inches for mountain bikes, and 20 inches for smaller bikes. Buy a tube that matches both the wheel diameter and the valve type (Presta, Schrader, or Dunlop — your old tube shows which one).
You do not need to remove the wheel from the bike to change the tube, though some people find it easier. If you leave the wheel on, flip the bike upside down so the wheel hangs freely. If you remove the wheel, lay it flat on the ground.
Key Takeaways
- A tire lever, pump, and replacement tube are the only tools you need, and the whole job takes about ten minutes.
- Insert the tire lever under the tire bead (the edge that sits on the rim) and pry it over the rim to expose the tube.
- Pull out the old tube completely, then check inside the tire for thorns, glass, or sharp objects that caused the puncture.
- Inflate the new tube slightly before installing it so it holds its shape and does not twist inside the tire.
- Seat the tire bead evenly on the rim all the way around before you pump it to full pressure, or the tube will pinch and puncture again.
Remove the tire from the rim using a tire lever
Deflate the tire completely if it is not already flat. Locate the tire bead — the edge of the tire that sits on the rim. Insert the flat end of the tire lever under the bead, about six inches away from the valve. Pry the bead up and over the rim edge. The tire will not come off in one motion; you are just breaking the seal.
Once the bead is loose, insert the tire lever again a few inches away from where you started. Pry again. Repeat this around the entire wheel until the bead is completely free from the rim on one side. You do not need to remove the tire completely — just enough to access the tube. Leave the other side of the tire seated on the rim.
Now pull the old tube out. Start at the valve and work your way around, peeling the tube away from the tire. Once it is free, set it aside.
Inspect the tire for the cause of the puncture
Before you install the new tube, run your fingers carefully along the inside of the tire. Feel for thorns, glass shards, or sharp objects. This is the most important step — if you miss the thorn, the new tube will puncture in the same spot within a few miles.
If you find a sharp object, remove it. If you find a cut or tear in the tire itself, the tire will need to be replaced, not just the tube. A new tube will not hold air if the tire is damaged. If the tire looks intact, you are ready to install the new tube.
Inflate the new tube slightly before installation
Unpack the new tube and check that the valve type matches your old one. Inflate it with a few quick pumps — just enough so it holds its shape and is not completely flat. A flat tube will twist and fold inside the tire, and when you pump it to full pressure, it will pinch and puncture when ready.
The tube should feel slightly firm but not hard. You are aiming for the tube to be just barely inflated, not at riding pressure.
Install the new tube and reseat the tire
Insert the valve through the rim hole first. Then work your way around the wheel, tucking the tube evenly inside the tire. Make sure the tube is not twisted and does not lie on top of itself anywhere.
Now push the tire bead back onto the rim, starting opposite the valve. Work your way around, using your hands to seat the bead evenly. This is where most people rush and cause problems — take your time and make sure the bead is fully seated on both sides of the rim all the way around. If the bead is not even, the tube will pinch when you pump it up.
Once the bead is seated, check one more time by looking at the rim from the side. You should see a thin line where the bead meets the rim all the way around. If there are any bulges or gaps, push the bead back down and reseat it.
Pump the tire to the correct pressure
Attach your pump to the valve. The valve stem should be perpendicular to the rim — if it is bent at an angle, the tube is not seated correctly. Stop and reseat the tire before pumping.
Pump slowly and steadily. Watch the tire as you pump — the bead should stay seated on the rim and not bulge outward. If it does bulge, stop when ready, deflate, and reseat the bead again.
Pump to the pressure printed on the side of your tire. Road bike tires typically need 80 to 130 psi (pounds per square inch). Mountain bike tires typically need 30 to 50 psi. The correct pressure is printed on the tire sidewall. Once you reach the right pressure, remove the pump and check that the valve is tight.
Test the wheel before riding
Spin the wheel and watch it. It should spin straight without wobbling side to side. Press on the tire with your thumb — it should feel firm but not rock hard. Squeeze the tire with your hand — you should not be able to compress it more than a quarter inch.
If the wheel wobbles, the bead may not be seated evenly. If the tire feels soft, you did not pump it to full pressure. If the tire feels too hard, you overpumped it. Make adjustments as needed before you ride.
Frequently Asked Questions
What if the tire lever damages the rim or tire?
Plastic tire levers are gentler on rims than metal ones. Insert the lever at a shallow angle and pry slowly rather than yanking. If you are worried about damage, use two levers at once — one to hold the bead up while you work the other around the wheel. This spreads the force and reduces the risk of denting the rim.
Can I patch the old tube instead of replacing it?
Yes, if the puncture is small and you have a patch kit. Clean the area around the hole, roughen it with the sandpaper in the kit, explore the adhesive, and press the patch on for the time the kit specifies. Patches work well for small holes but are less reliable than a new tube. Many riders carry a patch kit as a backup but replace the tube at home.
What if the new tube keeps puncturing in the same spot?
You missed a sharp object inside the tire. Remove the wheel, deflate the new tube, and inspect the inside of the tire again, this time more carefully. Run a rag along the inside to catch anything your fingers missed. Check the rim tape — if it is torn, sharp rim spoke ends can puncture the tube. Replace the rim tape if needed.
Do I need to remove the wheel to change the tube?
No. Flipping the bike upside down works fine for most people. Removing the wheel makes it easier to inspect the tire and reseat the bead, but it takes longer. Choose whichever method you are comfortable with.
How tight should the valve be?
Tight enough that it does not leak, but not so tight that you strip the threads. Tighten it by hand until you feel resistance, then give it a quarter turn more. If you over-tighten, you can crack the valve stem. Hand-tight plus a quarter turn is the standard.