How to Fix a Flat Bike Tire (Replace the Tube)

A flat tire doesn't have to end your ride. With two tire levers, a new tube, and a pump, you can fix it in about ten minutes. Here's how, following Park Tool's steps.

1. Step 1: Take Off The Wheel

Shift to the smallest rear gear if it's the back wheel. Open the quick release, or loosen the axle, and lift the wheel out. If you have rim brakes, you may need to open them first.

2. Step 2: Let All The Air Out

Let out any air that's left. Then push both edges of the tire, called the beads, toward the center of the rim to loosen them.

3. Step 3: Tire Levers

Hook a tire lever under the edge of the tire, and pull it over the rim. Add a second lever a couple of inches away, then slide it around the wheel. Never use a screwdriver. It can damage the rim and the tube.

4. Step 4: Find What Caused It

Pull out the old tube. Now carefully run your fingers around the inside of the tire, and look at the outside. If a thorn or piece of glass is still stuck in it, your new tube will go flat too.

5. Step 5: New Tube In

Put just enough air in the new tube to give it shape. Push the valve straight through the rim hole first, then tuck the tube inside the tire all the way around.

6. Step 6: Roll The Tire Back On

Starting at the valve, push the tire edge back onto the rim with your thumbs. Then check both sides to be sure the tube isn't pinched under the edge.

7. Step 7: Pump It Up

Inflate the tire to the pressure printed on its sidewall, and check it with a gauge. Then put the wheel back on, and close the brakes if you opened them.