A slow puncture causes a tyre to lose air gradually rather than going flat immediately. Because the pressure loss can happen over days or weeks, it is easy to miss until your TPMS warning appears, the tyre repeatedly needs inflating, or the car begins to feel different to drive.
Knowing what a slow puncture is, what causes one, and when to get professional help can prevent further tyre damage and help keep your vehicle safe.
Is One Tyre Keep Losing Pressure? Get It Checked
A slow puncture can be difficult to spot from the outside. Martins Tyres can inspect the tyre, identify the cause of the pressure loss and advise whether it can be safely repaired or needs replacing.
So, What Is a Slow Puncture?
A slow puncture is a small air leak that causes tyre pressure to fall gradually over time. Unlike a rapid puncture or completely flat tyre, the tyre may still look normal at first.
TyreSafe explains that slow punctures can take days or weeks to become obvious and may first be noticed through the vehicle’s TPMS or by seeing that the tyre is gradually deflating while parked. You can read its guide to punctures and puncture repairs for further guidance.
Repeated pressure loss should not simply be corrected by continually adding more air. The underlying cause needs to be identified.
What Can Cause a Slow Puncture?
Several different problems can cause gradual tyre-pressure loss.
Small Sharp Objects
Nails, screws, glass and other road debris can penetrate the tyre and create a small leak. The object may remain lodged in the tread, allowing air to escape slowly rather than causing the tyre to go flat immediately.
If you spot a nail or screw in the tyre, do not assume that removing it will solve the problem. Have the tyre inspected so a technician can establish whether a safe repair is possible.
Potholes and Kerb Impacts
Hitting a pothole or kerb can damage the tyre or wheel rim. TyreSafe identifies both potholes and kerb impacts as possible causes of slow punctures because they can damage the tyre sidewall or rim.
If you notice pressure loss after a hard impact, contact Martins Tyres and have the tyre and wheel inspected.
Wheel or Rim Problems
A damaged wheel rim or problems around the area where the tyre seals against the wheel can allow air to escape gradually. Corrosion can also interfere with the seal in some cases.
If repeated pressure loss continues but there is no obvious object embedded in the tyre, the wheel and tyre should be professionally checked rather than assuming the tyre itself is the only possible cause.
Faulty Tyre Valve
The valve and valve core help retain air inside the tyre. Damage, deterioration or a poor seal can therefore result in gradual pressure loss.
This means a slow puncture does not always involve a nail or hole in the tread. A professional check can help identify whether the tyre, valve or wheel is responsible.
How to Know if You Have a Slow Puncture
Frequent Pressure Loss
If one tyre consistently loses pressure faster than the others, even after being reinflated, it may indicate a slow leak.
If you are unsure whether a tyre is losing pressure, Martins Tyres offers a free tyre and air pressure check. This gives you an opportunity to identify a pressure problem before continuing to drive on an under-inflated tyre.
TPMS Warning Light
Your Tyre Pressure Monitoring System can alert you when tyre pressure falls below the expected level.
However, a TPMS warning does not tell you the cause of the pressure loss. A puncture, valve issue or another tyre problem may be responsible, so repeated warnings should be investigated.
If you suspect a problem with the monitoring system itself, Martins Tyres also provides TPMS checks and repairs.
Unusual Tyre Wear
Driving with incorrect tyre pressure can contribute to uneven or excessive tyre wear. If you notice an unusual wear pattern alongside repeated pressure loss, have the tyre inspected.
The Highway Code states that tyres must be correctly inflated to the vehicle manufacturer’s specification and advises motorists to check pressures when the tyres are cold. Read the Highway Code tyre-maintenance guidance.
Visible Damage or Embedded Objects
Sometimes the cause is easy to see, such as a nail or screw embedded in the tread. You may also notice cuts, bulges or other tyre damage.
Do not assume that an embedded object should simply be pulled out. Removing it may allow air to escape more quickly, and the tyre still needs to be assessed for repairability.
Can I Drive With a Slow Puncture?
Is it dangerous to drive with a slow puncture? You should not ignore a tyre that is steadily losing pressure.
The Highway Code requires tyres to be correctly inflated to the vehicle manufacturer’s specification and states that under-inflated tyres can adversely affect steering and braking. It also advises drivers with a flat tyre to stop as soon as it is safe to do so.
It Can Affect Handling
As pressure falls, the vehicle may not steer or respond as expected. If the tyre becomes significantly under-inflated, continuing to drive can also cause additional damage.
It Can Increase Tyre Wear
Incorrect pressure can contribute to excessive or uneven wear, potentially shortening the usable life of the tyre.
The Tyre Could Become Completely Flat
A slow leak can worsen, particularly if the tyre continues to lose air while being driven.
If the tyre is already flat, or you do not feel it is safe to drive to the garage, Martins Tyres offers mobile tyre fitting in Surrey. Our mobile service specifically covers motorists dealing with flat tyres and slow punctures.
Should I Repair or Replace a Tyre With a Slow Puncture?
Whether a slow puncture can be repaired depends on the cause, location and extent of the damage, as well as the overall condition of the tyre.
A small penetration within an appropriate area of the tread may be repairable after the tyre has been removed and inspected. Damage around the sidewall or outside the permitted repair area generally cannot be dealt with using a normal minor puncture repair.
Martins Tyres’ tyre puncture repair service involves inspecting the tyre, removing it from the wheel when appropriate and determining whether a safe repair is possible.
For a broader explanation of how punctures are assessed, you can also read our puncture repair guide.
If you’ve decided on a repair for your tyre, check out our process for repairing it here.
Why Choose Martins Tyres for Slow Puncture Repairs?
Martins Tyres is a family-run garage that has been supplying and fitting tyres since the 1970s. Our technicians can assess the cause of pressure loss and explain whether the tyre can be repaired safely or whether replacement is the better option.
You can learn more about Martins Tyres and our approach to straightforward tyre advice.
If you think you have a slow puncture, do not keep topping up the tyre indefinitely. Visit Martins Tyres for an inspection, or use our mobile service if getting the vehicle safely to the garage is a problem.