Why is my tyre losing air pressure?

Why your tyre keeps losing pressure

A tyre that repeatedly loses pressure is a problem that needs addressing. There are several likely reasons, some more serious than others.

Common problems

• Slow puncture - A nail, screw or sharp object embedded in the tread. This is the most common cause.
• Damaged valve stem - A cracked, corroded or loose valve stem will allow air to escape slowly.
• Poor bead seal - The seal between the tyre and the wheel rim may be compromised. This is especially true on alloy wheels where corrosion can build up.
• Sidewall leaks - A crack on the sidewall or an impact mark can cause slow leaks.
• Temperature drops - Cold weather even causes pressure to drop. If the tyre only seems low in cold mornings, but holds pressure the rest of the day, this may be the explanation.

What to do

If your tyre keeps losing pressure, it is a problem that cannot be ignored. Go to a garage for inspection. A slow puncture can usually be found quickly by submerging the inflated tyre in water or using a soapy water spray to pinpoint the leak.