The tread on your car tyres has a particular way of reading numbers and letters. But do you know what they mean? If you’re not sure, then it’s best to be aware and educated about the different codes that tyre manufacturers use to better understand how some parts of your vehicle work together. Understanding these things will help you figure out some technical problems that your car might be experiencing. This way, you can find tyre deals online and get them shipped straight to your door without having to make extra trips to the mechanic. When it comes down to it, knowing more information is always beneficial when it comes to car maintenance and ownership, so take the time out of your day-to-day life to learn about this important concept.
First of all, the tread on your Car Tyres Reading has a certain way of reading numbers and letters, which can differ from tyre to tyre depending on what company the tyres were made by. The code that shows up in many different car companies’ Goodyear tyres is an example of how you can easily identify what type of tyres you have installed on your car – M+S for Mud and Snow, for example. In any case, here are some examples:
P185/60R14 84 T
If you see something like the above example, then it means that the steering wheels should always stay locked whenever the vehicle moves forward or backwards even if it’s just at a slow crawl.
185 is the width of the tyre in millimetres, 60 is the aspect ratio that tells you how much room there is between the sidewall and the tread, R indicates that it’s a radial ply-tyre, 14 is the diameter of the rim in inches. At the same time, 84 refers to the wheelbase of a car. This means that this tyre would fit on a car with a wheelbase of 84 inches or something close to it. Lastly, T stands for tubeless tyres, which tells us that these tyres require an air compressor to be filled up before being put onto a vehicle. It might also just say ‘tubeless’ if you’re not using rims but rather a steel wheels.
185/60R14 or 185/65R14?
As you can see, it’s pretty easy to assume that the ‘R’ is referring to radial ply-tyres even if there are slight variations of this code. As for the aspect ratio, it doesn’t really matter whether you have a 60 or 65 aspect ratio because they both refer to how much space there is between the sidewall and the tread. Hence, these two kinds of car tyres are almost identical to one another except for their size. This means that if you happen to own a car with 14 inch rims on it, then your options will be limited when choosing which type of tyres you want because all of them are going to have the same measurements as the tyres above.
The following are another set of examples to help you see how the codes on your tyre work:
195/65R15 91H M+S A T 6.5JJ 15 X 6 ET45
195 is the width in mm, 65 refers to the aspect ratio, R means radial ply-tyre, 91 refers to the load index while H means that these tyres are for heavy vehicles like lorries and trucks (it doesn’t necessarily mean that it’s high speed though). The ‘M+S’ stands for mud and snow which you’ve already read about in this article, A stands for ‘all-season tyres’, T tells us it’s a tubeless tyre again while 6.5 stands for the rim diameter in inches, JJ means that there should be a load index of 91 or higher while 15 is how many millimetres deep the tread is. Lastly, ET stands for ‘e’ tire which means that it’s an electronic Goodyear Tyres Reading from 2012 onwards and 45 is the wheelbase (the number may be different).
P195/65R15 95H M+S C T 6JJ 15 X 5.5 ET45
Again, we see P and 195 but this time we also have 65 in reference to the aspect ratio, H meaning heavy-duty tyres like trucks and lorries, C standing for commercial vehicles such as buses and trucks again (C doesn’t necessarily mean high speed here either), 95 refers to the load index, T for tubeless and 6JJ is the wheel diameter in inches.
For more information on how your tyre works and what it signifies, you can always check your owner’s manual or refer to the website of a tyre manufacturer. As we said before, having knowledge of how to read tyres isn’t just important for making sure that they provide maximum grip on any surface – it’s also critical when it comes to car safety so don’t ignore this topic.