5. Do you know how old your tyres are?
Your tyres need to pass more than the tread depth test to be considered safe. Tyre age is also a safety factor.
Rubber compounds in a tyre deteriorate over time, regardless of the condition of the tread. This means that there can be instances where your tyres look fine but in actual fact require replacement due to their age. This can often be the case in regards to spare tyres, trailers or caravans that are used less often.
All tyres come with markings on their sidewall, which indicate the age of the tyre by specifying the week and year of manufacture. This is displayed as a four digit number, known as the build date. The first two digits represent the week of production during the year (from 1 to 52) and the second two digits represent the year of manufacture. For example, 2219 would mean that the tyre was made in the 22nd week of the year 2019.