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Why This Problem Should Not Be Ignored
If you keep adding air to the same tyre, you almost certainly have a slow puncture or air leak.
A healthy tyre should hold pressure for months.
Driving with under-inflated tyres causes:
- longer braking distance
- uneven tyre wear
- poor fuel economy
- risk of blowout
Quick Diagnosis Guide
| Symptom | Likely Cause |
|---|---|
| Flat overnight | Puncture |
| Loses air over days | Valve leak |
| After pothole | Bent wheel |
| Only in cold weather | Pressure contraction |
| Refilled many times | Internal tyre damage |
1. Slow Puncture
Small objects like nails or screws embed into the tyre and slowly release air.
You may not notice while driving.
Signs
- Pressure drops every 1–3 days
- Hissing sound when close
- Visible nail or screw
Repairable via tyre puncture repair
2. Faulty Valve Stem Leak
The tyre valve weakens over time and leaks air slowly.
Very common in older tyres.
Signs
- Bubbles when sprayed with water
- No visible puncture
- Pressure loss over a week
Fixed during tyre service
3. Damaged Wheel Rim
Potholes can slightly bend alloy wheels causing air leakage around the bead.
Signs
- Air loss after hitting pothole
- Tyre edge always deflates
- Repaired puncture but still losing air
Requires wheel & rim inspection
4. Temperature Changes
Cold weather reduces tyre pressure naturally.
Typical drop:
-
10°C drop = 1–2 PSI loss
But repeated refilling means another issue exists.
5. Internal Tyre Damage
Driving underinflated damages the inner structure.
Air escapes through microscopic cracks.
Signs
- No visible puncture
- Bulge forming
- Repeated pressure drop
Needs replacement with new tyre or part worn tyre
Is It Safe To Keep Inflating It?
No.
Repeated inflation overheats the tyre sidewall and can cause a motorway blowout.
A tyre losing air repeatedly is already structurally weakened.
Repair or Replace?
| Situation | Solution |
|---|---|
| Nail in centre tread | Repair |
| Sidewall damage | Replace |
| Large hole | Replace |
| Rim leak | Seal |
| Valve leak | Replace valve |
Typical UK Repair Costs
| Repair | Typical Cost |
|---|---|
| Puncture repair | £15–£30 |
| Valve replacement | £10–£20 |
| New tyre | £60–£150 |
| Alloy seal | £40–£80 |
When To Visit Immediately
Visit garage urgently if:
- Tyre flat overnight
- Pressure warning light on
- Bulge visible
- Steering feels heavy
- Recently hit pothole
Final Advice
A tyre never loses air without reason.
Ignoring it risks sudden failure at speed.
A quick inspection usually fixes it cheaply delay turns it into a tyre replacement.
