Fix a flat: changing an inner tube in ten minutes

Get out of traffic first

Stop somewhere safe. This guide is for a tyre with an inner tube, the inflatable tube inside. A tubeless setup needs a different repair plan.

Carry a tube matching tyre size and valve length, a pump and plastic tyre levers, tools for lifting the tyre edge. Practise wheel removal at home first.

The replacement

1. For a rear wheel, shift to the smallest rear sprocket. Release the wheel using your bike’s instructions. Do not squeeze a disc-brake lever with the wheel removed.
2. Release remaining air. Push the tyre edges towards the rim’s centre. Remove one edge with tyre levers, not a screwdriver. Take out the tube.
3. Locate the puncture and inspect the tyre outside and carefully inside. Sharp glass can cut fingers. Remove the cause. Check the rim tape covering spoke holes.
4. Add a little air to the replacement tube. Insert the valve and lay the tube inside without twisting. Refit the tyre edge, preferably by hand. Avoid pinching the tube with a lever.
5. Check that no tube is trapped. Inflate a little and check even seating before reaching suitable pressure. Secure the wheel as instructed, check braking and take a short test ride.

When to call for help

A large tyre cut, damaged rim or unfamiliar wheel fitting needs help. A fresh tube cannot repair a torn tyre. Ten minutes is not a safety deadline. Find a workshop and plan a way home.

What to do now

1. Match your repair kit to your wheels and check the pump.
2. Practise one complete tube change at home.
3. Pack the kit and save a return option for a repair you cannot complete.