How to Fix a Bike Flat Tyre or Puncture
Last updated: 4 September 2026
Quick Answer
Remove the wheel, take out the tube, find the puncture, patch or replace the tube.
Overview
A flat tyre is the most common bike problem. This guide covers fixing a puncture or replacing the inner tube.
Step-by-Step Fix
Safety & Preparation
Before beginning any repair, ensure you have isolated power or water supplies. Clear your workspace, gather standard hand tools, and wear appropriate personal protective equipment (PPE).
- Firstly, ensure your bike is stable, then open the quick-release lever or loosen the axle nuts on the wheel with a spanner. Carefully lift the wheel out of the frame or fork, making sure the chain comes off the cassette if it's the rear wheel.
- Completely release any remaining air from the tyre by pressing the valve stem. Now, insert a tyre lever between the tyre bead and the rim, levering the bead over the rim wall, and then use a second lever to work your way around the wheel until one side of the tyre is fully off the rim.
- Once one side of the tyre is off, pull the punctured inner tube out from between the tyre and the wheel rim. Inflate the tube slightly using your pump until it's firm, then carefully listen and feel for escaping air or submerge the tube in water to pinpoint the exact location of the puncture.
- Use the abrasive paper from your puncture repair kit to thoroughly roughen the area around the hole, ensuring it's larger than your chosen patch. Apply a thin, even layer of vulcanising solution (glue) to this roughened area, covering an area slightly bigger than the patch itself.
- Allow the glue to become tacky, usually for a few minutes, before firmly pressing the patch onto the prepared area, ensuring no air bubbles are trapped underneath. Once the patch is securely bonded, carefully re-insert the repaired inner tube back into the tyre, ensuring it's not twisted.
- Partially inflate the inner tube until it holds its shape, then carefully push the tyre bead back onto the rim, using your thumbs or levers for the last stubborn section, and ensure the tyre is seated evenly all the way around. Finally, fully inflate the tyre to the recommended pressure found on the tyre sidewall, and refit the wheel to your bike, securing the quick-release or axle nuts firmly.
Common Symptoms & Diagnostic Resolutions
Review the common error codes and operating symptoms below to quickly identify the root cause of the fault before ordering replacement parts.
| Symptom / Code | Likely Root Cause | Recommended Resolution |
|---|---|---|
| Tyre deflates quickly | Pinch flat or multiple punctures | Check for multiple punctures. |
| Patch doesn't hold | Surface not prepared | Roughen the tube more. |
Frequently Asked Questions
How do I prevent punctures?
Use puncture-resistant tyres and keep tyres properly inflated.
Can I fix a puncture without removing the wheel?
It is easier to remove the wheel.