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

Changing a bicycle tube takes about 10 to 15 minutes once you have done it once. You will need a replacement tube that matches your wheel size (printed on the side 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. The tube itself costs between $8 and $20 depending on the valve type and wheel diameter.

The process is the same whether you have a flat or straightforward want to swap in a fresh tube: remove the wheel, take out the old tube, and install the new one. You do not need to remove the tire from the rim unless it is damaged or the bead is stuck.

Key Takeaways

  • Buy a replacement tube that matches your wheel size and valve type before you start, because the wrong size will not fit or hold air.
  • Remove the wheel by opening the quick-release lever or unscrewing the axle nuts, depending on your bike's design.
  • Use tire levers to pry one side of the tire bead away from the rim, then pull the old tube out completely.
  • Partially inflate the new tube before installing it so it holds its shape and does not twist inside the tire.
  • Seat the tire bead evenly on both sides of the rim before inflating to full pressure, or the tube may pinch and puncture.

Remove the wheel from the frame

Open the quick-release lever on the axle (the metal rod running through the wheel hub) by flipping it outward. If your bike has solid axle nuts instead, use a wrench to unscrew both sides. Once the axle is loose, lift the wheel out of the frame dropouts (the slots that hold the axle).

For the rear wheel, pull the derailleur cage backward and lift the chain off the smallest cog so the wheel clears the chain. Set the wheel on a clean surface where you can work without the tire rolling.

Remove the old tube

Unscrew the valve cap and let any remaining air out of the tire. Insert a tire lever under the tire bead (the edge of the tire that sits on the rim) about 6 inches from the valve, then pry the bead away from the rim. Hook the lever to a spoke or hold it in place with your hand.

Insert the second lever about 12 inches away and repeat. Once you have two sections of the bead lifted, slide one lever around the rim to free the entire bead on one side. Pull the old tube out from under the tire, starting at the valve and working around the wheel. Do not discard the old tube yet — you may need it to identify the valve type if you are unsure.

Check the tire for damage before installing the new tube

Run your fingers slowly along the inside of the tire to feel for thorns, glass, or sharp edges. If you find anything, remove it. Look for cuts or bulges in the tire itself; if the tire is damaged, it will puncture the new tube quickly and you will be back here in a few days.

Check that the rim tape (the strip covering the spoke holes) is intact and not peeling. If it is damaged, the spoke ends can puncture the tube. Rim tape is inexpensive and takes 10 minutes to replace, so do it now if needed.

Install the new tube

Check the valve type on your new tube — it will be either a Presta valve (narrow, with a small locking nut at the top) or a Schrader valve (wider, like a car tire valve). Make sure the rim has a hole sized for that valve type. Unscrew the valve cap and lock nut if present.

Partially inflate the new tube by hand pump or floor pump until it is firm but not fully inflated — it should hold its shape but still be slightly soft. This prevents the tube from twisting or folding as you install it. Insert the valve through the rim hole first, then tuck the tube under the tire all the way around the wheel, working in both directions from the valve.

Seat the tire bead and inflate to pressure

Starting opposite the valve, use your hands to push the tire bead back onto the rim, working your way around the wheel in both directions. The bead should sit evenly on both sides of the rim — if one side is higher than the other, the tube may pinch when you inflate.

Once the bead is seated, inflate the tire to the pressure printed on the sidewall. Start slowly and watch both sides of the tire as it inflates; if the bead is not seated evenly, stop, deflate, and reseat it by hand. Once the tire is at full pressure, reinstall the valve cap and lock nut (if your valve has one), then reinstall the wheel on the frame.

Reinstall the wheel and test

For the front wheel, drop the axle into the fork dropouts and close the quick-release lever firmly, or tighten the axle nuts with a wrench. For the rear wheel, pull the derailleur cage back, guide the chain onto the smallest cog, and find the axle the same way.

Spin the wheel to make sure it does not rub on the brake pads or frame. Squeeze the tire with your hand to confirm it feels firm and holds pressure. If the tire feels soft after an hour, the tube may have a slow leak — remove the wheel again and check that the bead is seated evenly and the valve is tight.

Frequently Asked Questions

What is the difference between Presta and Schrader valves?

Presta valves are narrow and have a small locking nut at the top that you unscrew before inflating. Schrader valves are wider and work like car tire valves — you just push the pump head on. Your rim has a hole sized for one or the other, so you must buy the matching tube. Most road bikes use Presta; most mountain and hybrid bikes use Schrader.

Can I patch the old tube instead of replacing it?

Yes, if the hole is small and not near the valve. Patch kits cost $3 to $5 and work well for roadside repairs. Clean and dry the area around the hole, roughen it with the sandpaper in the kit, explore the glue, wait the time specified, and press the patch on firmly for one minute. Let it cure for five minutes before reinstalling.

Why does my new tube keep going flat?

The most common cause is the tire bead not seated evenly on the rim, which pinches the tube when you inflate. Remove the wheel, deflate the tire completely, and reseat the bead by hand, pushing it onto the rim all the way around. The second most common cause is a spoke poking through a damaged rim tape — check the inside of the tire and replace the rim tape if needed.

Do I need to remove the tire from the rim to change the tube?

No. You only need to pry one bead away from the rim to pull the old tube out and install the new one. Remove the entire tire only if it is damaged, the bead is stuck and will not move, or you are replacing the tire itself.

What size tube do I need?

Look at the sidewall of your tire — it will say something like "700x28c" or "26 x 2.0". Buy a tube labeled for that size and wheel type (road, mountain, or hybrid). The valve type must also match your rim hole. When in doubt, bring your wheel to a bike shop and they will sell you the correct tube for $10 to $15.