What you need before you start

Changing an inner tube takes about 10 to 15 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 new inner tube that matches your wheel size, and a pump. Most people also keep a patch kit as backup, though replacing the tube is faster if you are on the road.

Check your wheel size before you buy a replacement tube. The size is printed on the sidewall of your tire — common sizes are 700c (road bikes), 26 inch, 27.5 inch, or 29 inch (mountain bikes). The valve type matters too: most tubes have either a Schrader valve (looks like a car tire valve) or a Presta valve (thinner and taller, with a small locking nut at the top). Buy the same type as your old tube, or your pump may not fit.

Lay your bike on its side on a clean, flat surface. If you are changing the rear wheel, shift to the smallest chainring first — this makes removing and reinstalling the wheel easier.

Key Takeaways

  • You need a tire lever, a replacement tube that matches your wheel size and valve type, and a pump to change an inner tube.
  • Remove the wheel from the bike, then use a tire lever 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, then inflate to the pressure printed on the tire sidewall.
  • Reinstall the wheel, making sure the brake pads are centered and the quick-release or axle nuts are tight.

Removing the wheel from your bike

For the front wheel, open the quick-release lever on the hub (the center of the wheel) or unscrew the axle nuts by hand, depending on your bike. Pull the wheel straight toward you and lift it out of the fork.

For the rear wheel, open the quick-release or unscrew the axle nuts, then pull the derailleur (the mechanism that shifts gears) backward with your hand. This creates slack in the chain. Lift the wheel up and out of the chain and frame.

Set the wheel on the ground in front of you. The tire should be facing up so you can see the valve.

Removing the old tube

Let out any remaining air by pressing the valve. If it is a Presta valve, unscrew the small locking nut at the top first.

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 the tire away from the rim — you should hear a small pop as the seal breaks. Slide the lever around the rim to loosen one side of the tire completely, or use a second lever spaced around the wheel.

Once one side of the tire is loose, reach in and pull the old tube out. Start at the valve and work your way around. Do not throw the old tube away yet — you may need it to figure out what caused the puncture.

Inspecting the tire for damage

Run your fingers slowly along the inside of the tire, feeling for thorns, glass shards, or sharp objects. This is the most important step. If you skip it and install a new tube without removing the object that caused the first puncture, the new tube will fail within a few miles.

If you find a thorn or splinter, pull it straight out. If you find a cut or a bulge in the tire itself, the tire may need to be replaced — a new tube alone will not fix a damaged tire. Check the rim tape (the strip of material that covers the spoke holes) for damage as well. If the tape is torn or missing, spokes can puncture the new tube. Wrap electrical tape or duct tape over any exposed spoke holes as a temporary fix.

Wipe the inside of the tire with a clean cloth to remove dirt and debris.

Installing the new tube

Unpack the new tube and check that the valve type matches your wheel. Inflate it just enough so it holds its shape — about 20 to 30 percent full. This makes it easier to seat in the tire without twisting or pinching.

Insert the valve through the valve hole in the rim first. Then work the tube into the tire, starting on either side of the valve and working your way around. Make sure the tube sits evenly inside the tire all the way around — it should not bunch up or twist.

Once the tube is in place, tuck the tire bead back onto the rim. Start opposite the valve and work your way around in both directions. The last section, near the valve, will be tight — push the valve up into the rim to create slack, then pull the tire bead down over the rim. You may need to use your hands or a tire lever to work the last bit into place.

Inflating and checking your work

Inflate the tube to about half pressure. Stop and look at the tire from the side — the bead should sit evenly on the rim all the way around. If you see a bulge or a dip, let out the air, adjust the tube, and try again.

Once the bead looks even, inflate to the pressure printed on the tire sidewall. This is usually between 40 and 100 psi depending on the tire type and your weight. Do not guess — overinflating can cause a blowout, and underinflating makes the tire sluggish and prone to pinch flats.

Spin the wheel and watch the tire. It should not rub on the brake pads or the frame. If it does, the wheel may not be seated correctly in the frame.

Reinstalling the wheel on your bike

For the front wheel, lift it into the fork and lower it until the axle sits fully in the dropouts (the slots at the bottom of the fork). Close the quick-release lever or tighten the axle nuts by hand. The wheel should not move side to side.

For the rear wheel, pull the derailleur backward again and lift the chain onto the smallest cog. Lower the wheel into the frame and seat the axle in the dropouts. Close the quick-release or tighten the axle nuts. Spin the wheel — the chain should move smoothly without rubbing on the derailleur.

Spin the wheel one more time and check that the brake pads are centered on the rim. If they are rubbing, you may need to adjust the brake — this is beyond a tube change, but most bike shops can do it in a few minutes.

Frequently Asked Questions

Can I patch the old tube instead of replacing it?

Yes, if the puncture is small and you have a patch kit. Clean and dry the area around the hole, roughen it with the sandpaper in the kit, explore the adhesive, wait the time the kit specifies, then press the patch on firmly. Patches work best for small holes in the tube itself, not for valve leaks or large tears. On the road, replacing the tube is usually faster.

What if the new tube does not fit or the valve does not line up?

Check that you bought the correct wheel size and valve type. If the valve is too long and hits the rim, you may have a road bike tube in a mountain bike wheel, or vice versa. Return it and buy the right size. If the tube is too small or too large, it will not seat evenly — this usually means you grabbed the wrong size by mistake.

How do I know what caused the puncture?

Look at the hole in the old tube. A small, clean puncture usually means a thorn or glass. Two holes close together (a "pinch flat") means the tire was underinflated and the tube got squeezed against the rim. A hole near the valve means the valve failed. Finding the cause helps you avoid the same problem again — check your tire pressure regularly and watch for thorns on the road.

Do I need to remove the wheel to change a tube?

Yes, on most bikes. Some people try to change a tube without removing the wheel, but it is much harder and you risk damaging the tire bead or the rim. Removing the wheel takes an extra minute and makes the job much easier and safer.

What pressure should I inflate the tube to?

The correct pressure is printed on the sidewall of your tire, usually as a range like "40–65 psi". Use the higher end if you are heavier or carrying a load, and the lower end if you are lighter. Check the pressure with a floor pump or a hand pump with a gauge — guessing by feel leads to flats or sluggish handling.