By ShowMeStepByStepPublished Updated
Based on a video by Park Tool.
How to change a bike tire tube is the most common roadside repair a cyclist runs into. Knowing the steps turns a ride-ending flat into a 10-minute pit stop. This walkthrough from Park Tool's Calvin Jones covers the full process - how to remove a bike tire, find the puncture, install a fresh tube, and seat the bead so the tire holds pressure. Works the same on a road bike, mountain bike, hybrid, or kids' bike (though the rim sizes and tire widths differ).
If you also drive, see how to change a car tire for the same physics on a larger wheel, and how to check tire pressure to prevent the next flat - under-inflated tires are the single biggest cause of pinch flats on bicycles.
Flat tires happen. Knowing how to swap a tube yourself turns a ride-ending problem into a 10-minute pit stop. This tutorial from Park Tool's Calvin Jones covers the full process from start to finish, including how to figure out what caused the flat so it doesn't happen again.
The same technique works on road bikes, mountain bikes, and hybrids. All you need is a set of tire levers, a spare tube, and a pump. If you ride regularly, also keep a portable gauge in your saddle bag - under-inflated tires are the single biggest cause of pinch flats, and the fix is the same five-minute habit we cover in our tire-pressure check guide for cars (same physics, smaller wheels).
Presta vs. Schrader valves. Schrader valves are the fat ones you see on cars. Presta valves are skinny with a small threaded nut at the top. Both work the same way: press a pump on, inflate, remove the pump. Presta valves require unscrewing the small nut before inflating and tightening it back after. Most road bikes use Presta; most kids' bikes, hybrids, and mountain bikes use Schrader.
Road bike tubes. Road tires are narrow (700 x 23-28 mm typical) and run high pressure (80-130 PSI). The tube has to match the rim diameter (700c on most road bikes) and roughly match the tire width. A 700 x 25 mm tube can stretch to fit a 28 mm tire, but won't sit right in a 32 mm one.
Mountain bike tubes. Mountain tires are fatter (26", 27.5", or 29" rims, with widths from 1.95" to 2.5"+) and run lower pressure (25-50 PSI). Same removal process but the wider tire is easier to get over the rim because the rubber has more give. Tubeless setups skip the tube entirely; check your wheel for a tubeless-ready rim before assuming you need a replacement tube.
Hybrid and kids' bikes. Same general method, smaller rim sizes (20", 24"). Tubes are sized by rim diameter first and width second. Bring the old tube to the bike shop or read the size off the side of your existing tire when you buy a spare.
Tube vs. patch. A roadside flat is faster to fix with a fresh tube. Patch kits work great for at-home repairs after the ride: clean the tube, find the leak with water, sand the area, apply glue and patch, wait 5 minutes. Cheaper than a new tube, and a single tube can take 4-5 patches before it's worth retiring.
Five questions we get most often about swapping a tube, finding the cause of the flat, and getting the tire back on without pinching the new tube.
Three things, in order: under-inflation (pinch flats from the rim hitting the tube against the road), road debris (glass, thorns, sharp metal), and worn tires (the rubber goes too thin to protect the tube). Check the inside of the tire carefully before installing the new tube - a thorn that punctured the old one is often still embedded and will pop the new one within a mile if you miss it.
Read the side of your tire. The numbers will look like "700 x 25c" (road) or "26 x 2.0" (mountain). The first number is the rim diameter and has to match exactly. The second number is the tire width, and your tube should be in a range that includes that width. Most tubes have a printed range like "700 x 23-28c" - that tube fits any tire from 23 to 28 mm wide on a 700c rim.
Almost always one of three things: the puncture cause is still in the tire (re-inspect inside the casing with your finger), the tube got pinched between the bead and the rim during installation (deflate, push the bead aside, re-seat), or the rim strip is misaligned and a spoke is now poking through to puncture the tube.
No. The basic plastic Park Tool levers are about $5 and work on any rim. Avoid metal levers; they can scratch alloy rims and damage carbon fiber. If you're stranded without levers, the back of a plastic spoon works in a pinch. Two levers is the minimum; three makes it easier.
Look at the recommended PSI range printed on the side of the tire. Road bikes typically run 80-130 PSI, hybrids 50-80, mountain bikes 25-50. Heavier riders go toward the higher end of the range, lighter riders the lower end. Check pressure before every ride if you're a serious rider; once a week is plenty for casual riding. A floor pump with a built-in gauge makes this easy.
You need three things: tire levers, a spare inner tube, and a pump. A CO2 cartridge works instead of a pump if you're on the road. Carry all of these on every ride.
If you don't have a spare tube, you can patch the damaged one to get home. But swapping in a fresh tube is faster and more reliable.
Remove the dust cap from the valve. For Presta valves, loosen the small nut at the tip and press down to release air. For Schrader valves (the same kind on car tires), push the pin inside the valve with a small tool or the end of a tire lever.
Squeeze the tire all the way around to force out any remaining air. The tube needs to be totally flat before the tire will come off the rim.
Tip
If your wheel has a Presta valve with a threaded stem nut, loosen and remove that nut before trying to pull the tube out later.
Push both sides of the tire toward the center of the rim. This loosens the bead from the rim sidewall and gives you slack to work with.
Hook one tire lever under the bead anywhere except right at the valve. Pull back to lift the bead out of the rim. Place a second lever a few inches away and do the same. Once two sections are free, you can usually run a lever around the rest of the bead to pop it off. Pull the second bead off and remove the tire and tube from the wheel.
Inflate the old tube to about twice its normal width. This makes even tiny pinholes detectable. Run your hands slowly around the tube, listening and feeling for escaping air. If you can't find it by feel, dunk the tube in a bucket of water and look for bubbles.
The type of hole tells you what happened. A tiny pinhole means a thorn or piece of wire. Two parallel cuts side by side (called snake bites) mean you hit a pothole or ran too-low pressure. A large shredded hole is a blowout from a damaged tire casing.
Tip
Mark the hole location before deflating the tube. If you plan to patch it later, you won't have to find the hole again.
Run your fingers carefully along the inside of the tire. Feel for thorns, glass, or wire stuck in the casing. If something punctured the tube, it's probably still embedded in the tire and will puncture your new tube too.
Check the rim strip that covers the spoke holes. If the strip is damaged or shifted, the spoke ends will poke into the tube under pressure. Look for any spokes that are too long and sticking through.
Tip
If the tire casing has a rip or tear, use a tire boot as a temporary fix. It's a patch that goes inside the tire to keep the tube from poking through the gap.
Unfold the new tube and pump just enough air into it so it holds its shape. This prevents it from getting pinched or folded when you install it. Tuck the tube into the tire all the way around.
Feed the valve stem straight through the rim hole. Make sure it goes in straight, not at an angle. A crooked valve will get cut by the rim hole over time. Line up the valve with the tire's pressure label printed on the sidewall so you can find it later.
Push one bead at a time onto the rim by hand. Start at the valve and work around both sides until you meet at the opposite end. Before starting the second bead, make sure the tube is fully tucked inside the tire body.
The last section of the second bead is the tightest part. If you can't get it on by hand, use a tire lever carefully. Go slow - pinching the tube between the lever and rim means you'll be doing this whole process again.
Add a small amount of air and inspect the bead seat line all the way around the rim on both sides. The line should sit at the same height everywhere. If the bead pops up in one spot, deflate and push it back down. If it dips, try adding more air or apply soapy water as a lubricant to help it seat. Never use grease or oil.
Once the bead is evenly seated, inflate to the pressure printed on the tire sidewall. Tighten the valve lock nut and install the cap. You're ready to ride.
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Quick reference
5 questions, answers, and one-line explanations. Tap to expand.
1.Three essential tools to carry on every ride?
Answer: Levers + tube + pump
Tire levers, spare inner tube, and a pump (or CO2 cartridge). All three on every ride.
2.Presta valve vs Schrader valve?
Answer: Presta has small nut
Presta: loosen small nut at tip and press down. Schrader (like car tires): push pin inside with tool.
3.Inflate the old tube to find a puncture - how big?
Answer: Twice normal width
Makes even tiny pinholes detectable. Run hands around listening. Can't find by feel? Dunk in water.
4.Two parallel cuts side-by-side called 'snake bites' mean?
Answer: Hit pothole, low PSI
Hit a pothole or ran too-low pressure. Pinhole = thorn or wire. Large shredded hole = blowout from damaged casing.
5.Before installing new tube, you should...
Answer: Pump just a little air
Just enough air to hold its shape. Prevents pinching or folding during install.
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