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Tyres · Safety & Legal

When To Replace Tyres

Tyres are your only contact with the road. The UK legal minimum is 1.6mm — but most experts say replace at 3mm. Here's how to check yours and what replacement costs in 2026.

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When To Replace Tyres
The short answer

Legal limit 1.6mm — replace at 3mm

UK law requires a minimum tread depth of 1.6mm across the central three-quarters of the tyre. Most safety experts recommend replacing at 3mm — braking distances in wet conditions increase substantially below this point. Also replace any tyre showing sidewall cracking, bulging, or over 6 years old regardless of tread depth. Budget £80–£200 per tyre depending on brand and size.

Warning signs

Tyre Replacement Warning Signs

Tread depth at or below 3mm — replace before reaching the 1.6mm legal minimum
Tread wear indicators (TWIs) level with the road surface — replace immediately
Sidewall cracking, crazing or perishing — age-related degradation, replace regardless of tread
Bulge or blister in sidewall — internal structure has failed, dangerous, replace immediately
Tyre over 6 years old — manufacturer recommendation regardless of appearance
Embedded nail, screw or debris — may be repairable if in tread zone, professional assessment needed
Uneven wear (edge wear, centre wear, diagonal wear) — likely tracking, inflation or suspension issue
Vibration at speed — tyre balance, damage, or severe wear
Costs 2026

Tyre Replacement Costs UK 2026

Tyre category205/55 R16 (est. price)225/45 R17255/50 R19 (SUV)
Budget (e.g. Falken, Riken)£55–£80£70–£100£100–£140
Mid-range (e.g. Hankook, Toyo)£80–£120£100–£150£140–£190
Premium (e.g. Michelin, Continental)£120–£170£150–£210£200–£280
Ultra-high performance£160–£220+£200–£280+£260–£380+
Fitting + balancing (per tyre)+£10–£25+£10–£25+£15–£30

Prices per tyre, excluding fitting. Always fit premium or mid-range tyres to the rear axle for stability — never mix budget front with premium rear on the same axle if possible.

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Questions & answers

Frequently Asked Questions

What is the legal minimum tyre tread depth in the UK?
The legal minimum tread depth in the UK is 1.6mm across the central three-quarters of the tyre width, around the full circumference. Driving with tyres below this limit is a criminal offence — you face a fine of up to £2,500 and 3 penalty points per tyre. However, most tyre safety experts recommend replacing at 3mm, as braking distances increase significantly below this point.
How do I check tyre tread depth?
The simplest method is the 20p test: insert a 20p coin into the main tread grooves. If the outer band of the coin is hidden, your tread is above the legal minimum. If you can see the outer band, your tyres need replacing immediately. For a precise measurement, use an inexpensive tyre tread depth gauge (available for £3–£10 online). Check at multiple points around the circumference and across the width.
How long do tyres last in the UK?
Tread life depends heavily on driving style, tyre type, and road conditions. Typically, front tyres on a front-wheel drive car last 20,000–40,000 miles; rear tyres last longer at 30,000–60,000 miles. Beyond tread wear, rubber compounds degrade with age regardless of use. Most manufacturers recommend replacing any tyre over 5–6 years old, regardless of tread depth.
How much does it cost to replace tyres in the UK?
Budget tyres for a standard 205/55 R16 size cost £55–£80 each including fitting. Mid-range tyres from Michelin, Continental, or Bridgestone cost £90–£140. Premium tyres cost £130–£200+. Larger SUV or 4x4 tyres cost significantly more — £120–£250 each at mid-range. A full set of four mid-range tyres for an average family car costs approximately £400–£600 fitted.
What are the signs of an unsafe tyre?
Tread below 3mm, any visible cracking or crazing of the sidewall, bulges or blisters in the sidewall (tyre must be replaced immediately — internal structure has failed), embedded objects like nails or screws (check for slow punctures), uneven wear patterns (suggests tracking or suspension issues), and tyres over 6 years old regardless of condition.
Do worn tyres cause MOT failures?
Yes. Tyres below the legal 1.6mm minimum are a major MOT failure (dangerous defect category). Tyres that are noticeably close to the limit (around 2mm) typically generate an MOT advisory. Sidewall damage, bulges, or exposed cord are immediate dangerous defects. The tester also checks for matching tyre sizes and will note mismatched brands across an axle.
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The UK legal minimum tread depth is 1.6mm across the central three-quarters of the tread. Tyre costs are indicative UK ranges for 2026. MotR is not affiliated with DVSA or any tyre manufacturer. Last reviewed 13 June 2026.

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