What You Need Before You Start

Replacing a bicycle tire tube takes about 15 minutes once you have the right tools. You will need a new tube that matches your tire size (check the sidewall of your tire for the size, usually something like 700x25c or 26x1.95), two tire levers, and a pump. Tire levers are flat metal or plastic tools that help you pry the tire bead—the edge of the tire—away from the rim so you can remove the old tube and slide the new one in.

Before you buy a replacement tube, write down your tire size exactly as it appears on the tire. Tubes come in different sizes and valve types. The valve is the metal or plastic stem sticking out of the tube; most bikes use either a Schrader valve (looks like a car tire valve) or a Presta valve (thinner and has a small nut at the top). Buy a tube that matches both your tire size and your valve type, or you will not be able to install it.

Key Takeaways

  • You need a replacement tube in the correct size and valve type, two tire levers, and a pump to complete the job.
  • Remove the wheel from the bike, then use tire levers to pry one side of the tire away from the rim and pull out the old tube.
  • Inspect the inside of the tire for thorns, glass, or sharp objects before installing the new tube, or the new tube will puncture when ready.
  • Partially inflate the new tube before seating it fully in the tire, which prevents twisting and pinching during installation.
  • Reinstall the tire bead by hand first, then use your palms to roll the tire onto the rim, checking that the tube is not trapped under the bead.

Remove the Wheel and Deflate the Old Tube Completely

Start by removing the wheel from your bike. If you have rim brakes (the brake pads squeeze the rim), you may need to open the brake quick-release or unhook the cable to create clearance. For a front wheel, open the quick-release lever on the hub (the center of the wheel) or unscrew the axle nuts by hand, then lift the wheel out of the fork. For a rear wheel, shift to the smallest chainring and smallest cog first, then open the quick-release or unscrew the axle nuts, pull the derailleur back, and lift the wheel out of the chain.

Once the wheel is off the bike, press the valve on the old tube to release any remaining air. You should hear a hiss as the tube deflates completely. A fully deflated tire is much easier to work with because the tire bead will not grip the rim as tightly.

Pry Off the Tire and Remove the Old Tube

Insert a tire lever under the tire bead (the edge of the tire that sits on the rim) about 6 inches away from the valve. Pry gently until the bead lifts over the rim edge. Once you have lifted a section, you can usually work your fingers under the bead and peel the tire away from the rim by hand. You only need to remove one side of the tire; the other side can stay seated on the rim.

Once one side of the tire is loose, pull the old tube out completely. Start by removing the valve stem from the rim hole, then slide the tube out from under the tire. Set the old tube aside—you can recycle it or patch it later if you want to keep a spare.

Inspect the Tire Interior for Damage

Before you install the new tube, run your fingers carefully along the inside surface of the tire. Feel for thorns, glass shards, metal slivers, or any sharp object that could puncture the new tube. This step is critical: if you miss a thorn, your new tube will fail within a few miles. If you find something, pick it out with tweezers or a small knife.

Also check the tire for cuts or damage to the rubber itself. Small cuts are usually fine, but if the cut is deep enough that you can see the tire carcass (the fabric layer underneath), the tire may fail under pressure and you should replace it instead of just the tube. If the tire looks sound, you are ready to install the new tube.

Install the New Tube

Remove the new tube from its packaging and inflate it slightly—just enough so it holds its shape and is not completely flat. This step prevents the tube from twisting or folding as you work it into the tire, which can cause pinches and premature failure. You should be able to squeeze the tube gently; it should feel firm but not hard.

Insert the valve stem through the rim hole first. Then, working around the wheel, tuck the tube evenly under the tire bead all the way around. Make sure the tube is not twisted and sits flat against the rim. Take your time here; a twisted tube will pinch and fail as soon as you inflate it.

Reseat the Tire Bead on the Rim

Once the tube is in place, use your hands to roll the tire bead back onto the rim, starting opposite the valve and working your way around. Push the bead down and inward with the heels of your hands, rolling the tire onto the rim as you go. This is easier than it sounds because the tire bead is flexible. Work slowly and check frequently that the tube is not getting pinched under the bead as you roll the tire back on.

If you reach a point where the tire will not roll on by hand, use a tire lever to help, but be very careful not to pinch the tube. Insert the lever under the bead and pry gently, then roll the tire on a bit more. Repeat until the entire bead is seated. The tire should look even all the way around the rim, with no bulges or gaps.

Inflate the Tire to the Correct Pressure

Once the tire is fully seated, attach your pump to the valve stem. Check the sidewall of your tire for the recommended pressure range—it usually says something like "80–100 psi" or "50–65 psi" depending on the tire width. Inflate slowly and watch the tire as you pump. The bead should stay seated on the rim and not bulge outward.

Stop inflating when you reach the lower end of the recommended range, then check the tire one more time. Look all the way around the rim to make sure the bead is seated evenly and the tube is not visible anywhere. If everything looks good, inflate to your target pressure. Most riders prefer the middle or upper end of the range for a firmer ride, but you can experiment to find what feels best.

Reinstall the Wheel on the Bike

Reinstall the wheel by reversing the removal steps. For the front wheel, lower it into the fork and tighten the quick-release lever or axle nuts. For the rear wheel, pull the derailleur back, lower the wheel into the chain, and tighten the quick-release or axle nuts. Make sure the wheel is centered in the frame and spins freely without rubbing the brake pads or frame.

If you have rim brakes, reconnect the brake quick-release or cable. Spin the wheel by hand to confirm it does not rub, then squeeze the brake lever to make sure the brakes still work. Take a short test ride in a safe area to confirm the tire feels right and the brakes respond normally before heading out on a longer ride.

Frequently Asked Questions

How do I know if I have a Schrader or Presta valve?

A Schrader valve looks like a car tire valve—it is wider and has a small metal cap that screws on. A Presta valve is thinner and has a small nut at the very top that you must unscrew before inflating. Check your old tube or the valve on your wheel to see which type you have, then buy a replacement tube with the same valve type.

What if the tire bead will not stay seated on the rim?

This usually means the tube is twisted or pinched under the bead. Deflate the tire completely, remove the bead from the rim, and carefully reposition the tube so it sits flat and even all the way around. Make sure the tube is not folded or bunched anywhere. Then reseat the bead slowly by hand, checking frequently that the tube stays in place.

Can I use a tube from a different tire size?

No. A tube that is too small will stretch and fail, and a tube that is too large will bunch up and pinch. Always use a tube that matches your tire size exactly. The size is printed on the sidewall of your tire and on the packaging of the replacement tube.

How tight should I inflate the tire?

Check the sidewall of your tire for the recommended pressure range. Most road tires use 80–130 psi, while mountain and hybrid tires use 30–65 psi. Start at the lower end of the range and adjust based on how the bike feels. Higher pressure gives a faster, firmer ride; lower pressure gives more grip and comfort.

What should I do with the old punctured tube?

You can patch a punctured tube if the hole is small and you have a patch kit, which is much cheaper than buying a new tube. Locate the hole by inflating the tube and listening for air or feeling for moisture, then follow the instructions on the patch kit. Keep the patched tube as a spare for future flats.