Tyre Safety Guide UK: Everything You Need to Know

Summary

• Legal minimum is 1.6mm: Tyre tread must be at least 1.6mm deep across the middle three-quarters of the tyre. Below this is illegal and dangerous.
• Fines are steep: Each illegal tyre can earn you a £2,500 fine and 3 penalty points. Four bad tyres could mean 12 points and a ban.
• Check monthly: A quick 5-minute check each month keeps you safe. Our tyre tread guide shows you how.

Your tyres are the most important safety feature on your car. They're the only thing between you and the road.

Good tyres grip well, stop quickly, and keep you safe in rain. Bad tyres do the opposite.

This guide covers everything you need to know about tyre safety in the UK.

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Why Tyres Matter So Much

Think about it. Your four tyres each have a contact patch about the size of your hand. That's all that connects your car to the road.

Everything depends on that grip:

• Stopping: Good tyres can cut your stopping distance by metres. In an emergency, that could save a life.
• Cornering: Tyres with good tread grip the road in bends. Worn tyres slide.
• Wet weather: Tread channels push water away. Without enough tread, you'll aquaplane on wet roads.
• Winter driving: Tread depth matters even more in cold, wet, and icy conditions.

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UK Legal Requirements

The law in the UK is clear about tyres. Here's what you must know:

• Minimum tread depth: 1.6mm across the central three-quarters of the tyre, all the way around.
• No damage: Tyres must not have cuts, bulges, or exposed cord.
• Correct size: Tyres must be the right size for your car and match on each axle.
• Correct pressure: Tyres must be properly inflated to the manufacturer's recommended pressure.

Penalties for illegal tyres

Offence	Fine	Points
One illegal tyre	Up to £2,500	3 points
Two illegal tyres	Up to £5,000	6 points
Four illegal tyres	Up to £10,000	12 points (ban)

MOT fact: Tyres are one of the top 5 reasons for MOT failure. Check them before your test. See our guide on when to change your tyres.

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How to Check Your Tyres

Checking your tyres takes about 5 minutes. Do it once a month.

The 20p test for tread depth

1. Take a 20p coin.
2. Push it into the tread groove.
3. If you can see the outer band of the coin, your tread is below 1.6mm and the tyre is illegal.
4. Check in several places across the tyre and around its full circumference.

What else to check

• Pressure: Check with a gauge when tyres are cold. Your owner's manual has the correct pressure. It's also on a sticker inside the driver's door.
• Sidewalls: Look for bulges, cracks, or cuts. Any of these means the tyre must be replaced.
• Wear patterns: Uneven wear can mean alignment problems. Learn about wheel alignment vs balancing.
• Foreign objects: Check for nails, screws, or stones stuck in the tread.

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When to Replace Your Tyres

Replace your tyres when:

• The tread reaches 1.6mm (many experts recommend replacing at 3mm for better safety).
• You spot any bulges, cracks, or cuts on the sidewall.
• The tyre is more than 5-6 years old (rubber degrades over time).
• You notice uneven wear that can't be fixed with alignment.
• You've had a puncture that can't be safely repaired.

How long do tyres last?

It depends on your driving style and mileage. On average:

• Front tyres: 20,000-30,000 miles.
• Rear tyres: 30,000-50,000 miles.
• Age limit: Most manufacturers recommend replacing after 5-6 years, regardless of tread depth.

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Tyre Pressure Guide

Wrong pressure causes problems. Here's what happens:

Problem	Underinflated	Overinflated
Wear pattern	Edges wear faster	Centre wears faster
Fuel economy	Uses more fuel	Slightly less fuel
Grip	Reduced in corners	Less contact area
Ride comfort	Soft and vague	Hard and bouncy
Risk	Blowout risk	Reduced grip

Check pressure when the tyres are cold, before driving. Use the figures in your owner's manual or on the door sticker.

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Choosing New Tyres

When buying new tyres, consider:

• Correct size: Check the numbers on your current tyres (e.g., 205/55 R16). Match them exactly.
• EU tyre label: This shows fuel efficiency, wet grip, and noise ratings. Go for A or B ratings for wet grip.
• Brand: Premium brands (Michelin, Continental, Bridgestone) usually perform best. Budget tyres save money upfront but wear faster.
• Season: Summer tyres for most of the year. Winter tyres if you live in an area with regular snow.

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Don't Forget Your Spare

Many modern cars don't have a spare tyre. They come with a repair kit or a space-saver instead.

If you do have a spare:

• Check its pressure regularly. Spare tyres lose pressure over time.
• Make sure you know how to change a tyre. Our tyre changing guide walks you through it.
• Space-saver tyres have speed limits (usually 50 mph). Don't drive far on them.

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Your tyres are one of the cheapest safety features on your car. A set of four might cost £200-£500, but they protect you every time you drive. Check them regularly, replace them when worn, and never drive on illegal tyres.

Want to know more about keeping your car safe? Check our essential car maintenance checklist for all the basics.

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