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When it comes to car tyre maintenance there are many things that go unnoticed, like the alphanumeric codes inscribed on the side wall of your car’s tyre. Most of us don’t know what they are meant for. The side wall of a tyre carries vital information with respect to the tyre size and helps you get the aspect ratio of a tyre. The tyre ratio helps you find the right tyre for your car. By looking at it, at first instance, the cryptogram appears no less than a riddle. Despite that fact, we Indians have a legacy to solve the unsolved. So, come along, let’s crack down this mystery and unveil the secret behind.
Tyre aspect ratio explained
The side wall code lets you know the tyre specs such as width, load index, diameter, speed rating and profile of a particular tyre. Aspect ratio of a tyre in layman’s term is denoted by a percentage (nos.) which hints at the tyre height (or section height), from bead to the tread, with regards to the tyre width (or section width).
How does tyre aspect ratio matter?
If the aspect ratio of a tyre is higher, then the side wall will be clearly taller. You must have noticed that the trucks, buses and even luxury cars possess high aspect ratios of about 95. Such tyres, at one point may compromise on the handling part but will surely provide you with ultra comfort ride due to more amount of air inside the tyre. So what about the tyres with low aspect ratio? Such tyres, with shorter side walls, will play their role heroically while cornering and by providing better handling. However, here you cannot expect cushioning comfort, as the suspension suffers from the vibrations produced by tyres because the tyre here, holds less air.
Therefore, in order to provide a mix of decent handling quality and comfortable ride, an even balance of high and low aspect ratio is witnessed in most of our regular tyres.
Decoding the tyre measurements and tyre sizes code-
Understand this trail of confusing alphanumeric figures in this way.
For instance, if the side wall of a tyre reads: 205 / 60 R16 92 H
This means,
1) 205 (section width in mm) – It’s the total width of the tyre in millimetres.
2) 60 (aspect ratio in percentage) – As explained above, it’s the ratio of section height to the section width.
3) R (radial construction) – Denotes that the layers run radially across the tyre
4) 16 (rim diameter in inches) – The measurement of rim
5) 92 (load index) – The number states the maximum load carrying capacity.
6) H (speed symbol) – This symbol signifies the permissible speed.
Tyre aspect ratio calculator
Here, if we go by simple mathematics, the tyre aspect ratio percentage can be calculated as under:
H (Section Height of Tyre) / W (Section Width of Tyre) X 100 = Aspect Ratio (%)
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So, what would be a the aspect ratio on a tyre that states 205/- R16 Light Truck?
Hi,
Hi, The aspect ratio would be 0.55. Thank you.
Thanks
how
How to choose tyres for vehicles
Increasing the Aspect Ratio would mean increasing the circumference of the tyre. While this might mean a slightly softer ride, it also means slightly adverse corning. All this is ok and acceptable, but the extra circumference affects the speedo reading, distance travelled and fuel economy readings. A higher ratio means the tyre travels further on each rotation. This is the reason for having larger wheels when fitting lower profile tyres. An expensive exercise.
My tyre size is 195/65/R 15.
Can I increase aspect ratio by
195/70/R 15.
Please explain.
Dose it affect to much on stearing contol ?
Hi, Unfortunately, the size you have mentioned is not compatible with your original tyre size and vehicle. This will cause an issue in steering and have a negative impact on the mileage of the vehicle.
I have a Toyota Camry LE 1994 tire size is 195/70R/14 could I use 205 /70/14 or 205/65/14
Hi,
unfortunately, the sizes you have mentioned are not compatible with your vehicle. We would rather suggest you go for 195/65 R15 for which all tyre options are available here – https://www.tyremarket.com/Search/Car-Tyres/195-65-R15.
Thanks
Hi my car is fitted with 165/70R14 tyres from manufacturer.
I am thinking of using 165/80 R14 instead.
Will those be compatible with my vehicle and how it will affect all the aspects of my car??
Please reply
Thanks in advance.
Hi my car tyre size is 175/65 R15 can i upgrade to 195/60 R15… What will be the advantage and issues..
I want to increase tyre size from 175/65 R14 to 175/70 R14 for my Ford Figo Diesel Varient – 2013 Model. Is this impacts Mileage, Comfort, Road Grip, Shocks, Load on Engine and Speed Control? Could you please advise.
Hello,
175/70 R14 is completely not recommended for your current vehicle. It will have an adverse effect on your mileage, steering response and also incorrect speedometer/odometer readings. For the same rim size, you can rather go for 195/60 R14, which will be suitable.
Thanks
I own BYD atto3. My current tyre size is 215 / 55 R18 95V. I want to change it to 235 / 50 R18 97V. Can someone suggest what could be the issues or is it ok to go with this size? or Can i go with 235 / 55 R18 100V
Good explanation and grate work!!
For my car I use 175/60/R15 81H which is sparingly available. Like to know if I can replace them with 185/60/R15 84T
Hi,
the size you have mentioned (185/60 R15) is a slightly aggressive upsize to 175/60 R15 so we cannot guarantee if and what kind of adverse effect it can have.
Thanks
I have 2019 Hyundai grand i10 nios diesel, it has 175/60/R15 I would like to know if I can replace them with 175/65/R15
I have 2019 Tata Tiago XZ+, it has 175/60/R15 I would like to know if I can replace them with 175/65/R15 and how it will affect the mileage?
Hell Sir, we understand you would like to use 175/65 R 15 tyre in your Tata Tiago XZ+. We suggest not using a 175/65 R 15 tyre in your Vehicle as it will downgrade the vehicle’s overall performance and give a wrong reading towards the speedometer.