Tires carry their specifications on themselves. Tire markings explained!

You know that you need to buy new tires and are ready to log in to myzdegree.com  to buy yourself some new rubber for your wheels.  Even if you were happy with your current tires and now want to replicate the same, you can choose to improve the performance by scaling up to better performing tires for your car.

But, how to know the specifications of the current tires – size, performance, manufacturing types and so on?

Your tires carry it all on them!

The side wall of your tires is marked with some numbers and letters. These markings when deciphered accordingly, signify a certain quality aspect of the tire. Like the width, load carrying capacity, innermost diameter, the top speed it can deliver performance.

Armed with this information you could buy suitable tires online on myzdegree.com. If confused and want better performing tires that offer better wet gripping or aquaplaning or less noise and more comfort, talk to our service support advisors available 24X7 to get directed to the right tires for your needs.

Tire Markings Explained!

1. Width: The first letter in the series is a three digit number, which tells us the cross-sectional width of the tire – It is the sidewall to sidewall distance. In our example, 215/45R18 93Y it means that the tire width is 215 mm.

It is advisable to go by the vehicle requirements for the tire width. Yes, you can use wider tires that will increase your road grip but will reduce efficiency. The increased width adds to the contact surface with the road, but it comes at a cost of increased fuel consumption.
Aspect Ratio: The two digit number after the slash mark is the aspect ratio of the tire. The aspect ratio is expressing the height of the side wall with respect to the width of the tire as a percentage. In our example, 215/45R18 93Y – 45 is the aspect ratio. It means that the sidewall height of the tire is 45% of the width of

the tire i.e; 215mm. The higher the aspect ratio, the sidewall height is more making the tire almost look like a donut.

The aspect ratio of the tire determines the diameter of the tire and as such the height of the tire. Older and classier cars usually have more aspect ratio as they had thicker sidewalls, but the newer ones tend to have a lower aspect ratio, as it improves cornering and enhances the comfort of the drive.

2. Type of construction: This is usually a letter, either R or D or B. This signifies the type of construction of the tire, the arrangement of the layers of tire cords (plies) inside the tire. Nowadays, it is usually R for Radial. Radial tires are the predominant type of construction for passenger vehicle tires. D or B is for diagonal or bias belted type of tire construction. In a Bias ply, the tire cords are in a cross pattern. In a Radial type of construction, the steel belts do not go from sidewall to sidewall, this makes the tire’s sidewall more flexible.

3. Rim Size: It is the measure of the innermost dia of the tire, that seats on the car wheel’s rim. This is the first specifications that you need to note down from the current tire to buy a suitable match for your wheels. It is specified in inches and in our example 215/45R18 93Y – it is 18inches dia rim size. This means that this tire will fit an 18 inches wheel.

4. Load Index: In our example, 215/45R18 93Y – 93 signifies the load index. This indicates the maximum weight the tire can carry when it is inflated to its maximum safe pressure. 93 does not mean it can carry 93kg on it. This is a number which relates to a suitable weight in Kg, we will need a lookup table to find its equivalent in kgs. 93 from the look-up table means a maximum load of 650kgs can be carried by each tire. Load index number that varies from your current tire can be used, but make sure to go through the manufacturer recommendations to know the window.

5. Speed Rating: It signifies the maximum speed at which it is certified to carry its rated load capacity safely. It is a letter ranging from ‘A’ (lowest) to ‘Y’ (highest). The letters signify the speed in Km/h. In our example, 215/45R18 93Y the ‘Y’ rating means 300 km/h. So a car fitted with 4 of our example tires can reach a maximum speed of 300 km/h when inflated to its max safety pressure and carrying its rated load capacity of 650 kg/tire.

Q: 160 km/h

R: 170km/h

S: 180 km/h

T: 190 km/h

H: 210 km/h

V: 240 km/h

ZR: > 240 km/h

W: 270 km/h

Y: 300 km/h

By now, you are pretty sure of at least the basic necessities of your car’s tires. Then the next step for you is to buy them online at ZDegree through myzdegree.com

You’ll have your car fitted with new tires in 3 easy steps;

  1. You’ll need to choose the tire from our extensive choices of tires.
  2. Pay for it online
  3. Schedule the time and location that you’ll be available to get the tires fitted. It can be anywhere home, office or even the golf club.

Once done, our mobile tire garage will be there at the scheduled time and place for a hassle-free tire change. The mobile tire garage carries with it, equipment for easy mounting and dismounting of tires, digital wheel balancing, filling of air/nitrogen for the tires. Experienced and seasoned personnel will change the tires quickly and efficiently.

Book your tires through myzdegree.com and be treated to a worry-free tire change.


Leave a Reply

Your email address will not be published. Required fields are marked *