To fix a flat bike tire you remove the wheel, lever one side of the tyre off the rim, find what caused the puncture, patch or replace the inner tube, and put everything back. A new tube is faster; a patch is a good back-up. Check your bike manual for wheel removal details, especially with disc brakes or hub gears.
What You Need
- Two or three tyre levers
- A spare tube of the right size and valve type, or a patch kit
- A pump suited to your valve
- Wrench or hex key if the wheel is bolted on
- Rag and gloves
Step by Step
- Move the bike to a flat, clear spot and turn it upside down or use a stand.
- Open the brake release if your bike has rim brakes, and loosen the quick release or axle nuts.
- Take the wheel off, with care around the chain and any disc rotor.
- Let out any remaining air and unscrew the valve nut if there is one.
- Slide a lever under one tyre edge, hook it on a spoke, then work the next lever around until one side is free.
- Pull out the tube, working from the side opposite the valve.
- Run your fingertips carefully inside the tyre to find thorns, glass or wire. Remove anything you find.
- Add a little air to the new tube so it holds its shape, and tuck it inside the tyre.
- Push the tyre back onto the rim by hand, finishing at the side opposite the valve. Avoid levers at this point as they can pinch the tube.
- Check that no tube is caught under the tyre edge.
- Pump up to the pressure printed on the tyre sidewall.
- Refit the wheel and close the brake and release levers.
Patch or Swap?
| Option | Good when | Limits |
|---|---|---|
| New tube | On the road, in a hurry | Costs a tube each time |
| Patch | At home, small hole | Needs dry, clean tube and glue time |
To find a hole, inflate the tube and listen, or hold it near your cheek or in water for bubbles.
Preventing the Next Flat
Check tyre pressure regularly, since low pressure makes pinch flats more likely. Look over the tread for embedded debris after each ride, and replace tyres that show cracks or worn patches. Rim tape should cover every spoke hole evenly. Some riders fit puncture-resistant tyres or sealant, and the bike maker can tell you what suits your wheels. Carry a spare tube, levers and a small pump so a flat does not end your ride.
FAQ
Why do I keep getting flats in the same place?
Something sharp may still be in the tyre, or the rim tape may have moved and exposed a spoke hole.
What pressure should I use?
Use the range moulded into the sidewall and follow your bike maker’s guidance.
The Short Version
Remove the wheel, free the tyre, find the cause, patch or replace the tube, refit gently, and inflate to the printed pressure. Practise once at home so a roadside fix feels familiar.