When it comes to buying new tyres for your car, understanding the various markings on the sidewall of the tyre can be quite confusing. However, it’s important to know what these markings mean as they can affect the performance, safety, and overall lifespan of your tyres. In this post, we’ll be explaining the key markings on car tyres so you can make an informed decision when purchasing new tyres.
Tyre Size Markings Explained
The tyre size is usually the first thing you’ll notice on the sidewall of the tyre. It’s important to get the right size for your car, as using the wrong size can affect the handling and performance of your vehicle. The size is usually expressed in a sequence of numbers and letters. For example, P205/55R16.
- The “P” indicates that the tyre is designed for a passenger car.
- The “205” indicates the width of the tyre in millimetres.
- The “55” indicates the aspect ratio, which is the height of the sidewall as a percentage of the width.
- The “R” indicates that the tyre has a radial construction.
- The “16” indicates the diameter of the wheel in inches.
Tyre Age Markings Explained
Tyres are not designed to last forever, and it’s important to keep an eye on their age. Tyres can degrade over time, even if they haven’t been used. The age of the tyre is indicated by a four-digit number on the sidewall. This number represents the week and year that the tyre was manufactured. For example, if the number is “4219”, it means that the tyre was manufactured in the 42nd week of 2019. It’s recommended to replace your tyres every 6 years, regardless of how much tread is left on them.
Other Tyre Markings Explained
In addition to the size and age markings, there are other markings on the sidewall of the tyre that are worth understanding.
- Load Index: This indicates the maximum weight that the tyre can carry.
- Speed Rating: This indicates the maximum speed that the tyre can safely handle.
- Treadwear Rating: This indicates the expected lifespan of the tyre’s tread.
- Traction Rating: This indicates how well the tyre can grip the road in wet conditions.
- Temperature Rating: This indicates how well the tyre can withstand heat and dissipate it.
How to Read a Tyre Size
Now that you understand what the various markings on the sidewall of a tyre mean, you can easily read a tyre size. Here’s an example of how to read the size “P205/55R16”:
- P: Passenger car tyre
- 205: Tyre width in millimetres
- 55: Tyre aspect ratio
- R: Radial construction
- 16: Wheel diameter in inches
By understanding the markings on your car tyres, you can make an informed decision when buying new ones. It’s important to get the right size, check the age, and understand the other markings on the sidewall to ensure you’re getting the best performance and safety out of your tyres. Remember to replace your tyres every 6 years, even if the tread is still good, to avoid any potential safety hazards.