Apart from knowing the size of the tyre, most of us have no clue about why these numbers are there and what do they mean. Every car manufacturer prescribes a certain type of tyre based on several factors such as weight of the car, engine power, mileage and traction, overall price of the car etc. However when we go to replace these tyres, we simply go by the advice of the tyre retailer and in many cases, generally the tyre with the maximum commission for the dealer is the recommended one.
To make sure you don’t fall into this trap, we decided to unravel the mystery behind these numbers and help you understand them better so that you can take an informed decision before your next tyre purchase.
Whenever you’re going to buy new tyres for your car, do check this simple guide to know which tyres are suitable for your car.
- P/LT/ST/C: Most tyre markings start with one or more letters. In the picture above, it starts with P which tells us that this tyre is designed for Passenger Vehicle. However, there are many other tyres that are designed for different type of vehicles, for example, LT for Light Truck or SUVs, ST for Special Trailer, C for commercial vehicles such as delivery trucks and vans.
- Tyre Width: Next comes, a three digit number that tells us the cross-sectional width of tyre in millimeters. The tyre width, 185 is measured from the widest point of the inner sidewall to the widest point of the outer sidewall when properly mounted.
- Aspect Ratio: It is a two digit number that indicates the distance of the sidewall from the wheel rim to the outside of the tread. We have 75 as the aspect ratio. A higher aspect ratio means a higher-profile tyre with a taller sidewall while a tyre with a low aspect ratio will have a shorter sidewall.
- Tyre Construction(R, D, B): The letter that follows the two-digit aspect ratio tells us the tyre’s construction. We have the R rating which means that the tyre has Radial construction. Radial tyres are the one where the internal body plies of the tyre radiate outward from the center. If there’s a D instead of an R, the tyre has a Bias Ply construction, meaning that the internal body plies of the tire are crisscross in a diagonal pattern. In Bias Belted tyres (marked as B), the internal plies crisscross like in a D construction, but there’s also an extra layer of reinforcing belts under the tread area. Belted tyres are rarely seen these days while 98% of cars have Radial tyres.
- Diameter (in inches): This denotes the diameter of the wheel. The number 14 means that the tyre should be matched to a 14-inch diameter wheel.
- Load Rating: This tells us how many pounds a tyre can safely carry. The number 82 is assigned to a specific load carrying capacity of 1047 pounds (per tyre).
- Speed Rating: A Speed Rating of S means that the tyre can easliy achieve a speed of 180 km/h. It tells you how fast this tyre can go. For more information on speed ratings refer to the table below.
After figuring out the which tyre will be the right fit for your car and driving style, next you should choose the tyres which are apt for the weather condition you mostly drive in. If you drive in extreme climates, make sure you choose Snow tyres for colder regions or Wet tyres for areas with heavy rains
If you’re unsure about which tyre will be the best for your car then speak to the experts at Automen on 8010696969 to know the best tyres for your car.