How to check your tyres: tread depth and pressure
To check your tyres, measure tread depth with a gauge or the 20p test and verify pressure with a gauge against the vehicle handbook values.
Why regular tyre checks matter
Tyres are the only contact between your car and the road. Checking them regularly helps maintain safety and control, especially in wet conditions. Regular checks also support your MOT preparation and can help avoid issues during an inspection. Poor tyre condition affects braking, handling and fuel use. It is good practice to inspect tyres at least once a month and before long journeys.
Legal tyre tread depth requirements
The legal minimum tread depth for most cars, vans and light goods vehicles first used on or after 3 January 1933 is 1.6mm across the central three-quarters of the tread and around the entire circumference. Primary grooves must meet this depth. Secondary grooves are not counted. Vehicles first used before that date require 1.0mm. Driving below the limit can result in a fine of up to £2,500 per tyre and three penalty points per tyre. Check your MOT status at https://www.checkmot.com.
How to check your tyre tread depth
Use a tread depth gauge placed in the main grooves. Check multiple points around the tyre. Alternatively, insert a 20p coin into the tread; if the outer band is visible, the tyre may be below the legal limit. Measure across the central three-quarters of the breadth of tread. A tread pattern is the combination of plain surfaces and grooves extending across the breadth of the tread and round the entire circumference. Check all four tyres and the spare if fitted. Look for uneven wear that may indicate alignment or suspension problems. See the MOT checklist for more preparation tips.
How to check tyre pressure
Remove the valve cap and press a pressure gauge firmly onto the valve. Compare the reading to the pressures listed in the vehicle handbook or on the driver’s door pillar. Check tyres when cold for accuracy. Incorrect pressure can affect handling and fuel efficiency. Inflate to the recommended level using a suitable inflator if needed. Replace the valve cap after checking.
Recommended tools for tyre checks
A digital or mechanical pressure gauge and a tread depth gauge give reliable readings. Wireless TPMS systems provide ongoing monitoring. These tools help you stay within legal limits and maintain safe driving conditions. Heading into winter? Read our winter driving checklist.
Shop the kit
Mechanical tyre pressure gauge
Tyre Tread Depth Caliper, 0-25mm
Digital Tyre Pressure Gauge with Backlight
Tyre Tread Depth Gauge – 0–25mm
Tyre Inflator Gun with Digital Pressure Gauge
Solar Tyre Pressure Monitoring System – Wireless TPMS
Digital Tyre Pressure Gauge – 2–99.5 PSI, PSI/BAR/kPa
When to replace your tyres
Many experts recommend replacing tyres at 3mm for better wet-weather performance. Check your MOT status and book reminders at https://www.checkmot.com. Inspect for damage such as cuts, bulges or embedded objects during each check.
Checked on 17 October 2026 against MOT inspection manual, section 5 (GOV.UK) and RAC tread guide.
Frequently asked questions
What is the legal tyre tread depth in the UK?
1.6mm across the central three-quarters of the tread for most vehicles.
How do I perform the 20p test?
Insert a 20p coin into the tread; if the outer band shows, the tyre may need replacement.
Should I check tyre pressure when the tyres are warm or cold?
Check when cold for the most accurate reading.
Can I drive with tyres at the legal minimum?
It is legal but experts advise replacing at 3mm for safety.