Tyre Safety & When to Replace Your Tyres
Learn how to recognise worn, damaged or unsafe tyres, understand legal
tread depth requirements and know when it is time to replace your tyres.
Expert advice for drivers in Bangor, County Down and across Northern Ireland.
Your tyres are the only part of your vehicle in direct contact with the road,
so their condition has a major influence on braking, steering, stability and
wet-weather grip.
Knowing when a tyre needs replaced is therefore important for both safety and
legal compliance. This guide from Bangor Tyre Company answers
the most common questions motorists ask about tyre wear, tread depth, damage,
tyre age and replacement.
Tyre Tread Depth
The legal minimum tyre tread depth for most cars in the UK and Northern Ireland.
What is the legal tyre tread depth in Northern Ireland?
For most cars, the legal minimum tread depth is
1.6mm across the central three-quarters of the tyre,
around its entire circumference.
Driving on tyres below the legal limit can result in penalties and,
more importantly, significantly reduce your vehicle’s ability to grip
and stop safely in wet conditions.
Should I wait until my tyres reach 1.6mm?
Not necessarily.
Although 1.6mm is the legal minimum, tyre performance can decline as
tread depth reduces, particularly on wet roads.
Many motorists choose to replace tyres before they reach the absolute
legal limit, especially when approaching winter or periods of heavy rain.
Why is tyre tread important?
Tyre tread helps maintain contact between your vehicle and the road,
particularly when driving through water.
The grooves in the tread help channel water away from the tyre’s contact
patch. As tread wears down, the tyre becomes less effective at clearing
water, increasing the risk of reduced grip and aquaplaning.
When Should Tyres Be Replaced?
Low Tread
Replace tyres when tread is approaching or has reached the legal limit.
Visible Damage
Cuts, bulges, cracking or exposed cords can make a tyre unsafe.
Uneven Wear
Irregular wear can indicate alignment, pressure or suspension problems.
How do I know if my tyres need replacing?
Common warning signs include:
- Tread approaching the legal limit
- Cracks in the sidewall
- Bulges or bubbles
- Cuts or visible damage
- Uneven tread wear
- Repeated pressure loss
- Excessive vibration
- Poor wet-weather grip
How many miles should tyres last?
There is no fixed mileage because tyre life depends on the vehicle,
tyre type, road conditions, driving style, alignment, pressure and
maintenance.
Some tyres may need replacing after relatively modest mileage, while
others can provide significantly longer service when properly maintained.
A low-mileage tyre can still become unsafe due to age, cracking, impact
damage or prolonged periods of incorrect tyre pressure.
Tyre Damage
Is a bulge in a tyre dangerous?
Yes. A bulge or bubble in the sidewall can indicate damage to the tyre’s
internal structure.
A tyre with a significant sidewall bulge should be inspected immediately
and will normally require replacement rather than repair.
Can a cracked tyre still be used?
It depends on the severity and location of the cracking.
Minor surface ageing may not always make a tyre immediately unsafe, but
deeper cracks can indicate deterioration of the rubber and tyre structure.
If in doubt, have the tyre professionally inspected.
Can sidewall damage be repaired?
Sidewall damage is generally not suitable for conventional puncture repair.
The sidewall flexes considerably while driving, so damage in this area
can compromise the tyre’s structural integrity.
What should I do after hitting a pothole?
Inspect the tyre and wheel for visible damage and pay attention to any
vibration, pulling, steering changes or pressure loss.
Potholes can damage tyres, wheels and wheel alignment even where there
is little obvious external damage.
How Old Are Your Tyres?
Do tyres become unsafe with age?
Tyres naturally deteriorate over time as the rubber compounds age.
Heat, sunlight, storage conditions and usage can all influence this process.
An older tyre may still have plenty of tread but should be inspected for
cracking, hardening or other signs of deterioration.
How can I tell how old my tyre is?
Tyres normally carry a date code on the sidewall. The final four digits
represent the week and year of manufacture.
For example, 3224 means the tyre was manufactured during
week 32 of 2024.
Should tyres automatically be replaced after a certain number of years?
Age should be considered alongside condition, usage and manufacturer
recommendations.
Older tyres should be inspected regularly even where tread depth remains
acceptable. If there is visible deterioration or uncertainty about their
condition, professional inspection is the safest approach.
Uneven Tyre Wear
What causes tyres to wear unevenly?
Common causes include:
- Incorrect tyre pressure
- Poor wheel alignment
- Wheel balancing issues
- Worn suspension components
- Repeated pothole impacts
- Aggressive driving
Why is my tyre worn more on one side?
Excessive wear on the inner or outer edge commonly indicates a wheel
alignment problem.
Having the alignment checked can help identify the cause and prevent
premature wear on replacement tyres.
What does wear in the centre of the tyre mean?
Excessive wear through the centre of the tread can sometimes be associated
with incorrect inflation pressure.
Always use the tyre pressures recommended by your vehicle manufacturer
rather than relying on the maximum pressure shown on the tyre itself.
What does wear on both tyre shoulders mean?
Wear on both outer shoulders can be associated with prolonged underinflation.
Incorrect pressure increases tyre flexing and can accelerate wear while also
affecting fuel efficiency and handling.
Tyres, MOTs & Legal Requirements
Can worn tyres cause an MOT failure?
Yes. Tyres can contribute to an MOT failure if they do not meet legal
requirements or are considered unsafe.
Issues can include insufficient tread, significant damage, exposed
cords or tyres unsuitable for the vehicle.
Can damaged tyres cause an MOT failure?
Yes. Serious cuts, bulges, structural damage or exposed tyre cords can
result in the tyre being considered unsafe.
Having your tyres inspected before an MOT can identify obvious problems
before the vehicle is tested.
What happens if I drive with illegal tyres?
Driving with tyres that do not meet legal requirements can result in
penalties and points on your driving licence.
More importantly, badly worn or damaged tyres can significantly affect
braking, steering and grip, particularly in wet conditions.
Tyre Pressure & Safety
How often should I check my tyre pressures?
A good routine is to check tyre pressures approximately once a month
and before long journeys.
Always check them against the pressures recommended by the vehicle
manufacturer.
Why is correct tyre pressure important?
Correct tyre pressure supports safe handling, braking, fuel efficiency
and even tread wear.
Both underinflation and overinflation can negatively affect tyre
performance and lifespan.
Why does my tyre keep losing pressure?
Repeated pressure loss can be caused by a puncture, leaking valve,
wheel corrosion, bead-sealing issue or damage to the tyre.
A tyre that continually needs reinflated should be professionally inspected.
Does cold weather reduce tyre pressure?
Yes. Tyre pressure can fall as ambient temperatures decrease, making
pressure checks particularly important during colder months.
How to Check Your Tyres
Check Tread
Look across the full tread width rather than inspecting only one area.
Inspect Sidewalls
Look for cracks, cuts, bulges or other visible signs of damage.
Check Pressure
Use the manufacturer’s recommended pressures and check tyres when appropriate.
How often should I visually inspect my tyres?
A quick visual inspection every few weeks is a sensible habit, and
tyres should also be checked before long journeys.
Can Bangor Tyre Company check my tyres?
Yes. If you are unsure whether a tyre is worn, damaged or suitable
for continued use, our team can inspect it and advise whether repair,
replacement or another service is required.
Avoid guessing. If you notice damage, repeated pressure loss, unusual
vibration or uneven tread wear, have the tyre professionally inspected.
Concerned About Your Tyres?
If you are unsure about tyre tread, damage, pressure or uneven wear,
visit Bangor Tyre Company for professional advice. We can inspect your
tyres and help determine whether they are safe to continue using or
whether replacement is recommended.