You need a new tube, two tire levers, and a pump

Changing a bicycle tire tube takes about 10 to 15 minutes once you have done it once. You will need a replacement tube that matches your tire size (printed on the sidewall of your tire), two tire levers (plastic or metal tools that pry the tire bead away from the rim), and a hand pump or access to a floor pump. Most of the work is mechanical — no special skill required, just patience and the right sequence of steps.

The hardest part for first-timers is getting the tire bead back onto the rim without pinching the new tube. This guide walks you through that step and the others in order, so you know what to expect before you start.

Key Takeaways

  • Remove the wheel from the bike first, then deflate the tire completely before you try to pry the tire bead off the rim.
  • Use two tire levers spaced apart to work the tire bead off gradually; forcing one lever too hard can bend the rim or break the lever.
  • Once the bead is off on one side, slide the old tube out and inspect the inside of the tire for thorns, glass, or sharp debris before installing the new tube.
  • Inflate the new tube slightly (just enough so it holds its shape) before you reseat the tire bead, then finish inflating after the bead is fully seated.
  • The tire bead must sit evenly on both sides of the rim; if it bulges on one side, deflate and work that section back into place.

Remove the wheel and deflate the tire completely

Start by taking the wheel off the bike. On a front wheel, open the quick-release lever or unscrew the axle nuts, then lift the wheel out of the fork. On a rear wheel, shift to the smallest cog, 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, press the valve to let all the air out of the tire. Do not skip this step — a tire under pressure is much harder to pry off the rim and you risk damaging the rim or hurting your hands. After the tire is flat, you can begin working the tire bead (the edge of the tire that sits on the rim) away from the rim.

Pry the tire bead off the rim with two levers

Insert a tire lever under the tire bead about 6 inches away from the valve. Pry gently until the bead lifts over the rim edge. Do not force it — if it will not move, work a second lever in nearby and pry from two points at once. Once you have lifted the bead at two spots, you can usually work one lever around the rim to free the entire bead on one side.

The goal is to get the tire bead completely off on one side of the rim while leaving the other side seated. Once one side is free, the old tube will slide out easily. If you try to pry both sides off at once, the tire becomes harder to handle and you risk pinching the new tube later.

Inspect the tire interior for debris before installing the new tube

With the old tube out, run your fingers carefully along the inside of the tire, feeling for thorns, glass shards, or sharp wire. This is the most important step for preventing a flat a few miles down the road. If you find something, remove it and feel the spot again to make sure nothing is embedded.

Also check the rim tape (the strip covering the spoke holes on the rim). If it is torn or missing, the spokes can puncture the new tube. Rim tape is inexpensive and takes a few minutes to replace; if yours is damaged, this is the time to do it. If the tape is intact, you are ready to install the new tube.

Install the new tube and reseat the tire bead

Inflate the new tube just enough so it holds its shape — about 20 to 30 percent of full pressure. This makes it easier to position without twisting or pinching. Insert the valve through the rim hole first, then tuck the tube evenly around the inside of the tire all the way around the rim.

Starting opposite the valve, use your hands to work the tire bead back onto the rim. Push the bead down and inward with the heel of your hand, working your way around the wheel. When you get close to the valve, the last section will be tight — this is normal. Work it on gradually rather than forcing it, because forcing can pinch the tube between the bead and the rim.

Once the bead is seated all the way around, look at the rim from the side. The tire should sit evenly on both sides of the rim with no bulges or dips. If one section bulges outward, that means the bead is not fully seated there. Deflate slightly, work that section back into place, and try again.

Inflate to the correct pressure and check the seal

Once the bead is seated evenly, inflate the tire to the pressure printed on the sidewall. Most road tires use 80 to 130 psi; most mountain and hybrid tires use 30 to 50 psi. Use a pump with a pressure gauge so you can see when you have reached the target.

As you inflate, watch the tire bead on both sides of the rim. It should move smoothly onto the rim without bulging or rolling. If the bead starts to bulge on one side, stop, deflate, and reseat that section by hand before continuing. Once the tire is fully inflated and the bead is seated evenly, the job is done. Reinstall the wheel on the bike and you are ready to ride.

What to do if the bead will not seat evenly

If you have inflated the tire and the bead still bulges on one side, the tube may be twisted under the bead or pinched between the bead and rim. Deflate completely, work that section of the bead off by hand, and check the tube position. Make sure the tube is not folded or twisted, then work the bead back on and inflate again.

If the bead still will not seat after a second attempt, the tire itself may be damaged or the rim may be bent. Inspect the tire for cracks or splits and the rim for dents or warping. If you find damage, the tire or rim will need to be replaced — a tube change alone will not fix the problem.

Frequently Asked Questions

Can I patch the old tube instead of replacing it?

You can, but only if the hole is small and not near the valve. Patch kits work best for punctures smaller than a quarter inch. If the hole is large, the valve is damaged, or you cannot find the hole, replacement is faster and more reliable. Patching takes time to dry and the patch can fail on the road.

What size tube do I need?

The size is printed on the sidewall of your tire in the format 700x25c (road) or 26x2.0 (mountain). Buy a tube labeled for that size. Tubes come in ranges — a 700x25-28c tube fits both 25mm and 28mm tires. When in doubt, bring your wheel to a bike shop and they will match it for you.

How do I know which way the valve goes through the rim?

The valve stem points outward from the rim so you can attach the pump. Insert it through the rim hole first, then work the tube into the tire. If the valve is pointing inward toward the spokes, you have it backwards — remove it and flip it around.

What if I pinch the new tube while seating the bead?

You will hear or feel a small pop. Deflate when ready, remove the wheel, and take the tube out. Inspect it for the hole and decide whether to patch or replace. If you have a patch kit, you can patch and try again. If not, you will need a second replacement tube.

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

It is much easier if you do. Removing the wheel gives you room to work and lets you inspect the tire interior properly. Some people change tubes with the wheel still on the bike, but you risk pinching the tube and the angle makes it harder to seat the bead evenly.