how-to
How to Check Tyre Tread Depth: 3 Simple Methods
Table of Contents
- Why Checking Tyre Tread Depth Matters
- UK Legal Tyre Tread Depth Requirements
- Method 1: How to Check Tyre Tread with a 20p Coin
- Method 2: Using a Tyre Tread Depth Gauge
- Method 3: Visual Inspection and Wear Indicators
- Uneven Tyre Wear Causes and What They Signal
- When to Replace Your Tyres and Book Professional Fitting
- Frequently Asked Questions
Last Updated: October 14, 2026
Why Checking Tyre Tread Depth Matters
Your tyres are your vehicle's only contact with the road. Worn tyres lose grip, especially in wet conditions. To maintain safety, you should check tyre tread depth regularly and replace tyres when needed, as they affect your braking distance, handling, and overall safety.
Checking tyre tread depth regularly helps you spot wear before it becomes dangerous. It also helps you avoid failing an MOT test, which requires a minimum tread depth across the tyre's width.
At Dalin Car Care, we recommend checking your tyres at least once a month. Many drivers ignore this simple check until a problem becomes serious. A few minutes now can prevent accidents, failed MOTs, and costly emergency repairs later.
UK Legal Tyre Tread Depth Requirements
The legal minimum tyre tread depth in the UK is 1.6 millimetres across the central three-quarters of the tyre width. This is the point at which tyres must be replaced by law.
However, safety experts recommend replacing tyres at 3 millimetres. Grip and wet braking performance drop significantly below this level. Your stopping distance increases on wet roads when tread falls below 3 millimetres.
According to the UK government's guidance on tyre safety, driving with tyres below the legal limit is illegal and can result in fines and penalty points. Many insurance companies will not cover accidents where illegal tyres contributed to the incident.
Dalin Car Care checks tread depth as part of routine tyre inspections. We advise customers when their tyres are approaching the legal limit, giving them time to plan replacements.
Method 1: How to Check Tyre Tread with a 20p Coin
The 20p coin method is quick and free. It gives you a rough check without any tools.
To check tyre tread depth, take a 20p coin and insert it into the tread grooves of your tyre. Push the coin in as far as it will go. If the outer ring of the coin is still visible above the tread, your tyre tread is below 1.6 millimetres and needs replacing immediately.
If the coin disappears into the tread, your tyre has adequate depth. However, this method only tells you if you've hit the legal minimum. It doesn't measure the exact depth or identify worn areas.
Test all four tyres, and check multiple spots around each tyre. Wear is often uneven, so check the inner edge, outer edge, and centre of the tread.
Method 2: Using a Tyre Tread Depth Gauge
A tyre tread depth gauge gives you a precise measurement. These tools are inexpensive and widely available.
Insert the gauge's probe into the tread groove. Press it down until the gauge's foot sits flat on the tyre surface. Read the measurement on the scale. Most gauges measure in millimetres.
Take readings at multiple points on each tyre. Check near the sidewall, the centre, and the opposite sidewall. This shows you whether wear is even or concentrated in one area.
Many garages, including Dalin Car Care, have professional gauges and will check your tyres for free. A professional check takes minutes and gives you exact measurements.
Method 3: Visual Inspection and Wear Indicators
Modern tyres have built-in wear indicators. These are small rubber bars moulded into the tread grooves at 1.6 millimetres depth.
When the tread wears down to these bars, they become level with the tread surface. When you see continuous rubber bars across the tread, your tyres have reached the legal limit and must be replaced.
Visual inspection also reveals damage. Look for cuts, cracks, bulges, or objects embedded in the tyre. These require immediate replacement, regardless of tread depth.
Check the tyre sidewalls for damage too. Sidewall damage cannot be repaired and means the tyre must be replaced. Bulges or blisters on the sidewall indicate internal damage.
Uneven wear patterns tell you something is wrong with your vehicle. If the inner or outer edge is worn more than the centre, check your wheel alignment and suspension. If the centre is worn more, check your tyre pressure.
Uneven Tyre Wear Causes and What They Signal
Uneven wear means your tyres are not wearing evenly across their width or around their circumference. This signals problems with your vehicle that need attention.
Inner or outer edge wear suggests incorrect wheel alignment. Your wheels point slightly inward or outward, causing one edge to bear more weight. Alignment checks are quick and affordable.
Centre wear indicates overinflation. Your tyres are pumped too hard, pushing the centre of the tread down onto the road harder than the edges. Check your tyre pressure against the manufacturer's specification, found on a sticker inside your driver's door.
Wear on one side only can signal suspension problems. Worn shock absorbers, springs, or other suspension components allow your vehicle to lean to one side, wearing that edge faster.
Scalloping or wavy wear around the circumference suggests worn suspension or dampers. The tyre bounces as it rolls, creating a wave pattern.
Many of these issues affect your MOT test. Worn suspension, incorrect alignment, and tyre problems are all MOT failure points. Dalin Car Care can inspect your vehicle and identify what's causing uneven wear.
When to Replace Your Tyres and Book Professional Fitting
Replace your tyres when tread reaches 1.6 millimetres by law. However, safety experts recommend replacing at 3 millimetres, especially if you drive often in wet conditions.
Replace tyres immediately if you spot:
- Cuts or cracks in the tread or sidewall
- Bulges or blisters on the sidewall
- Objects embedded in the tyre
- Uneven wear that signals suspension problems
- Repeated loss of pressure
- Visible damage from hitting a pothole or kerb
Professional fitting ensures your new tyres are balanced and fitted correctly. Unbalanced tyres cause vibration, uneven wear, and steering problems.
Dalin Car Care provides professional tyre fitting in Dagenham and serves customers from nearby areas including Barking, Becontree, Chadwell Heath, Romford, Rainham, and Hornchurch. We fit tyres from quality brands including Continental, Michelin, Pirelli, and Bridgestone.
Booking is straightforward. Contact us with your vehicle details and tyre size. We can often fit tyres the same day. Our team balances and fits your tyres properly and checks your tyre pressure.
Frequently Asked Questions
What is the legal minimum tyre tread depth in the UK?
The legal minimum tyre tread depth in the UK is 1.6 millimetres across the central three-quarters of the tyre. However, many safety experts recommend replacing tyres at 3 millimetres for better wet weather grip and braking performance. Dalin Car Care advises checking your tyres regularly to ensure they remain safe and within legal limits.
Can you use a 20p coin to check tyre tread depth?
Yes, the 20p coin method is a quick, effective way to check tyre tread depth at home. Insert a 20p coin into the tread grooves with the outer band facing downward. If the outer band is visible, your tread is below the legal minimum of 1.6 millimetres and replacement is recommended. If the band is hidden, your tread depth is adequate.
How often should you check your tyre tread depth?
Check your tyre tread depth monthly and before longer journeys. Regular checks help you spot wear early and avoid safety risks. If you notice uneven wear, visible damage, or repeated pressure loss, have your tyres inspected professionally. Dalin Car Care provides tyre checks and tread depth inspections for customers throughout the area.
What causes uneven tyre wear?
Uneven tyre wear is typically caused by incorrect tyre pressures, misaligned wheels, worn suspension components, or aggressive driving habits. Inner or outer edge wear suggests alignment issues, while centre wear indicates over-inflation. Professional inspection can identify the root cause and prevent premature tyre failure. Dalin Car Care can assess your tyres and recommend the appropriate repairs.
Checking your tyre tread depth regularly keeps your vehicle safe and helps you avoid MOT failures and emergency repairs. The 20p coin method is free and quick, but professional measurement gives you exact readings. When your tyres need replacing, Dalin Car Care provides honest advice and professional fitting with quality brands. Contact us today to book a tyre check or replacement in Dagenham.
