7 Signs Your Tyres Need Replacing Right Now.

Sign 1: Tread Depth Below 3mm (or Near the Legal Limit)

The UK legal minimum tread depth is 1.6mm across the central three-quarters of the tyre. However, independent research consistently shows that tyre performance — particularly stopping distances in the wet — begins to deteriorate significantly below 3mm. By the time you reach 1.6mm, your wet-weather stopping distances are dramatically longer than at 3mm.

Check tread depth with a 20p coin. If the outer band of the coin is visible when inserted in the tread grooves, the depth is below 3mm and replacement should be considered soon. If you can see the border of the coin entirely, you're likely below 1.6mm — that's illegal.

Sign 2: Sidewall Bulge or Bubbling

A sidewall bulge — a visible lump or blister on the tyre sidewall — means the internal reinforcement cords have broken. This is a structural failure. The tyre is dangerous and must be replaced immediately. A bulging tyre can fail without warning at any time, particularly under motorway conditions.

Do not drive on a tyre with a sidewall bulge. Call TyreBlitz on 0208 079 1031 for immediate replacement.

Sign 3: Visible Cracks in the Sidewall

Rubber degrades over time due to UV exposure, ozone, and temperature cycling. This causes the rubber to develop fine cracks, particularly in the sidewall. These cracks (crazing) are a sign of rubber aging and loss of elasticity. A tyre with significant sidewall cracking is prone to sudden failure, even if the tread depth is still legal.

As a general rule, tyres older than 5 years should be inspected by a professional annually. Tyres older than 7–10 years should be replaced regardless of appearance, per most manufacturer recommendations.

Sign 4: Uneven Tread Wear

Uneven wear across the tyre width indicates a problem — either with the tyre itself or with the vehicle:

• Wear on both outer edges, good in the centre: Under-inflation. The tyre sidewalls are carrying excess load.
• Wear in the centre, good on edges: Over-inflation. The tyre contact patch is reduced to the middle.
• Wear on one edge only: Wheel misalignment. This also means the tyre on the opposite side is likely wearing unevenly too.
• Patchy, uneven wear: Could indicate wheel balancing issues, suspension problems, or aggressive braking patterns.

Uneven wear shortens tyre life and affects handling. If you notice uneven wear, replace the affected tyres and address the underlying cause.

Sign 5: Tyre Age Over 5 Years

Tyre rubber degrades from the moment it is manufactured — regardless of whether the tyre has been used or not. A tyre sitting in a garage for 5 years experiences rubber aging the same as a tyre that has been driven on. Many manufacturers recommend:

• Inspect tyres annually after 5 years from manufacture date
• Replace all tyres after 10 years from manufacture date, regardless of appearance

To find the manufacture date, look for the DOT code on the tyre sidewall. The last four digits indicate the week and year of manufacture (e.g., 1823 = 18th week of 2023).

Sign 6: Persistent Vibration or Pulling

If your car vibrates at certain speeds, pulls to one side, or the steering wheel feels different than usual, tyres may be the cause. Possible tyre-related causes:

• Wheel out of balance
• Tyre with flat spot (from extended stationary storage)
• Internal tyre damage
• Uneven tread wear

These symptoms can also indicate wheel alignment or suspension issues — but the tyres are always worth inspecting first.

Sign 7: TPMS Warning Light Stays On

The Tyre Pressure Monitoring System (TPMS) warning light indicates a tyre has lost pressure (typically 25% or more below the recommended level). A persistent TPMS warning that doesn't clear after you inflate the tyre to the correct pressure may indicate:

• A slow puncture (nail, screw, or valve leak)
• A faulty TPMS sensor (sensors need replacement every 5–7 years)

Do not ignore a TPMS warning. Driving significantly under-inflated accelerates tyre wear, reduces fuel efficiency, and dramatically increases the risk of a sidewall failure or blowout.

What To Do If Your Tyres Show Any of These Signs

Don't wait for a blowout or a roadside emergency. If you spot any of these warning signs, call TyreBlitz on 0208 079 1031. We'll come to you — at home, at work, or wherever you're parked — and replace the affected tyres on the spot. No trip to a garage, no waiting for an appointment.