* The tire is damaged. If the tire has been damaged, the sidewall may be compromised and air will leak out. This can be dangerous, as the tire may not be able to support the weight of the vehicle.
* The tire is too old. Run-flat tires have a lifespan of about 10 years. After that, the rubber can start to break down and the tire may not be able to hold air.
* The tire is not properly inflated. Run-flat tires need to be inflated to a higher pressure than other tires. The recommended pressure is usually listed on the sidewall of the tire. If the tire is not inflated to the correct pressure, it may not be able to hold air.
If you are unable to put air into your run-flat tire, it is important to have it inspected by a qualified mechanic.
