What You Need Before You Start
Changing a bicycle tire requires only a few tools, most of which cost under $20 and last for years. You will need tire levers (plastic or metal tools that pry the tire off the rim), a new inner tube or a patch kit if you are repairing rather than replacing, and a pump to reinflate. A wrench may be necessary if your wheel uses bolt-on axles instead of quick-release levers, though most modern bikes have quick-release.
Before you begin, identify which wheel is flat and whether the problem is the tire itself (the rubber outer layer) or the inner tube (the inflatable bladder inside). A puncture in the tire will let the tube bulge out; a pinched or punctured tube will cause the tire to go flat even if the tire itself is undamaged. If the tire has a visible cut or bulge, it must be replaced. If the tube is punctured, you can patch it or swap in a new one—swapping is faster and more reliable for a first attempt.
Key Takeaways
- Remove the wheel by opening the quick-release lever or unbolting the axle, then lift the chain off the rear sprocket if you are working on the back wheel.
- Use tire levers to pry one side of the tire off the rim, then pull out the old inner tube completely.
- Inspect the inside of the tire for thorns, glass, or sharp objects that punctured the tube, and remove anything you find.
- Insert a new or patched tube, starting at the valve stem, then work the tire bead back onto the rim by hand and with levers if needed.
- Inflate the tire to the pressure printed on its sidewall, checking that the tire sits evenly on the rim as you pump.
Removing the Wheel from the Frame
The first step is to detach the wheel from the bicycle frame. On the front wheel, open the quick-release lever (a hinged metal arm on the axle) by flipping it away from the wheel, then unscrew the opposite end slightly until the wheel lifts free. If your bike has bolt-on axles instead, use a wrench to loosen the nuts on both sides of the axle, turning counterclockwise until they are loose enough to remove by hand.
For the rear wheel, the process is the same, but you must first move the chain out of the way. Shift the bike into the smallest gear (the easiest pedaling gear), which moves the derailleur backward and creates slack in the chain. Open the quick-release or unbolt the axle, then lift the wheel up and away from the frame. The chain will hang freely once the wheel is removed.
Removing the Tire and Old Tube
Lay the wheel flat on a clean surface. 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 stem. Pry gently until one side of the tire lifts over the rim edge. Slide the lever around the rim, lifting the tire bead as you go, until one full side of the tire is off.
Once one side is free, reach in and pull out the inner tube. Start at the valve stem and work your way around, peeling the tube away from the tire. Do not force it—if it catches, check that the tire bead is fully lifted. Once the tube is out, set it aside. You do not need to remove the other side of the tire yet; you can work on the new tube with the tire still partially on the rim.
Checking the Tire for Damage
Before installing a new tube, inspect the inside of the tire carefully. Run your fingers slowly along the inner surface, feeling for thorns, glass shards, or sharp metal pieces. These are the most common cause of repeated punctures. If you find anything, remove it with tweezers or a small tool. Pay special attention to the area where the old tube was punctured—debris often clusters there.
Look at the tire itself for cuts, bulges, or worn spots. A small puncture (less than 1/8 inch) in the tire can sometimes be ridden on if the tube is patched, but a large cut or a bulge means the tire must be replaced. If the tire is damaged, install it now before putting in the new tube, since you will need to remove the tube again to swap the tire.
Installing the New Tube and Tire
Inflate the new tube slightly—just enough so it holds its shape and does not fold on itself. This prevents twisting and pinching when you install it. Insert the valve stem through the rim hole first, then work the tube around the inside of the tire, making sure it sits evenly and does not bunch up anywhere.
Now reseat the tire bead onto the rim. Start opposite the valve stem and work your way around, pushing the tire bead down onto the rim with your hands. The tire will resist at first; this is normal. Once you have worked your way around, use a tire lever if needed to help the last stubborn section onto the rim. Be careful not to pinch the new tube between the lever and the rim—insert the lever at an angle and pry gently rather than forcing it straight in.
Inflating and Checking Your Work
Attach your pump to the valve stem and inflate the tire to the pressure listed on the tire sidewall. This pressure is usually between 30 and 100 PSI depending on the tire type and width. Inflate slowly and watch the tire as it fills. The tire bead should seat evenly on the rim all the way around—you will see a thin line where the tire meets the rim, and this line should be straight and consistent.
If the tire bead is not seating evenly, stop inflating, let out some air, and work the tire bead back into place by hand. Then reinflate. Once the tire is fully inflated and seated correctly, remove the pump and spin the wheel to make sure it does not rub on the frame or brakes. Reinstall the wheel on the frame by reversing the removal steps: align the axle with the frame dropouts, close the quick-release or tighten the bolts, and for the rear wheel, guide the chain back onto the smallest sprocket.
Common Mistakes to Avoid
The most frequent error is failing to remove debris from inside the tire before installing the new tube. Even a tiny thorn will puncture the new tube within a few miles. Take time to inspect thoroughly, and if you are not sure whether something is sharp, remove it anyway.
A second common mistake is pinching the new tube between the tire lever and the rim while seating the tire. This creates a small hole that may not be obvious until you ride. To avoid this, use your hands as much as possible and resort to the lever only for the final stubborn section. Insert the lever at a shallow angle and pry gently.
Finally, many people reinstall the wheel without checking that the tire is seated evenly. An uneven bead will cause the wheel to wobble and may cause the tire to fail under load. Always spin the wheel and watch the tire before you consider the job done.
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 the area around the hole, roughen it with the sandpaper in the kit, explore the adhesive, wait the time specified on the kit, and press the patch firmly for at least one minute. Patching works well for a single small hole but is slower than swapping a tube. If the tube has multiple holes or a large tear, replacement is more reliable.
What if the tire bead will not seat onto the rim?
The tire may be too tight or the rim may have debris on it. Deflate the tire completely, remove it, and wipe the rim clean with a dry cloth. Reinflate slowly and watch the bead carefully. If it still resists, the tire may be slightly too large for the rim—this is rare but can happen with aftermarket tires. Check that you have the correct tire size for your wheel.
How do I know what pressure to inflate to?
The correct pressure is printed on the sidewall of the tire, usually as a range like "50–65 PSI". Narrower tires (road bikes) use higher pressure; wider tires (mountain bikes) use lower pressure. Start at the middle of the range if you are unsure. A pressure gauge on your pump will show you the exact PSI as you inflate.
Do I need to remove the wheel to change a tire?
Yes, you must remove the wheel to access the tire and tube. The wheel cannot be changed while it is attached to the frame. Removing it takes only a few seconds with a quick-release lever and is much easier than trying to work around the frame.
What if I get a flat while riding and do not have a new tube?
A patch kit is lighter and smaller than a spare tube, so many riders carry one instead. Patch the hole following the kit instructions, reinflate, and ride home carefully. Patched tubes are temporary—replace the tube with a new one as soon as you can, since patches can fail under pressure.