What Is Aspect Ratio On Tires – Dimension information embossed on the sidewall of the tire provides important details about the tire. Once you know how to decipher the information, you can determine the tire’s purpose, dimensions, load capacity, speed, etc. you will be able to understand better.
Some tire size designations begin with a letter(s) that identifies the type of vehicle and/or the type of service for which they are intended. Common letter designations for passenger and light truck tires are P, LT, T, and C.
What Is Aspect Ratio On Tires
Passenger tires manufactured to Tire and Tire Association (TRA) standards begin with the letter P and are known as P-metric tires.
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Passenger tires made according to the standards of the European Tire and Tire Technical Organization (ETRTO) start without a letter. These sizes are known as hard metric or avrometric sized tires. Euro-metric sizes are similar to P-metric sizes, but usually differ subtly in load-carrying capacity.
Light truck tires manufactured to TRA standards often start with two letters: LT. LT indicates that the tire is a light truck size intended for use on pickup trucks with higher payload and towing capacity than passenger cars.
In older sizing conventions, the LT designation may be at the end of the tire size. These sizes are known as flotation light truck sizes. An example of this type of size convention is 35×12.50R17LT.
A tire size starting with the letter T indicates that the tire is a temporary spare or mini spare. These types of tires are intended for temporary use only until the damage to the tire can be repaired or replaced.
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Euro-metric size designed for carrying heavy loads and/or towing trailers C. Ends with the letter C. Indicates that the tire has a commercial tread and is intended for vans or trucks. 195/70R15C is an example of this type of sizing convention.
The three-digit number defines the tire’s section width in millimeters. The original wheel may not quite match this, but it’s close.
The two-digit number below the section width identifies the tire’s aspect ratio. The aspect ratio is defined as the percentage of section height divided by section width. In the example below, the tire’s aspect ratio is 70 percent, so the tire’s section height would be 129.5 mm. The higher the aspect ratio, the taller the sidewall of the tire.
The letter R following the wheel ratio identifies the tire construction as a radial tire. In rare cases, D will determine the construction of a warp layer where the body moves diagonally across.
How To Read Your Tire
In recent years, ETRTO has adopted F branding standards that allow tire manufacturers to identify tires with self-supporting, sliding constructions by tire size.
The last two numbers in the tire size indicate the diameter of the rim or the size of the tire the tire is intended to fit.
The ring diameter followed by two or three numbers and the letter next to it is known as the service description. Service descriptions indicate the load index, which determines the maximum load capacity of the tire, and the speed rating, which determines the maximum allowable speed.
This table shows the load index and maximum load capacity of typical passenger tires. The maximum load capacity at maximum pressure is also available on the sidewall of the tire. In this example, a P265/70R17 with a load index of 116 would have a maximum load of 2,756 pounds per tire.
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Passenger tires are also defined as light load (LL), standard load (SL), or sidewall extra load (XL). P-metric and aurometric are similar in size, but the inflation pressure at maximum load varies slightly between the two.
Light truck tires are defined by load range, which ranges from load range B to load range F. Most tires on the market are in the C, D and E load range. This table shows the load index of the tire. Each light truck size is defined by a two-digit load index. The first number is the maximum load in single-wheel applications and the second number is the maximum load in dual-car applications. In this example, the 121/118 is 3197 pounds in single application and 2910 pounds in dual application.
The maximum tire load is the largest load the tire is designed to carry. Since a tire’s load-carrying capacity is related to tire size and how much inflation pressure is actually used, maximum loads are rated with tires inflated to industry-specified inflation pressures.
Never exceed the maximum vehicle load limit stated on the vehicle placard or owner’s manual. Never exceed the load limit printed on the sidewall of the tire. The maximum load can be carried only at the maximum cold air pressure indicated on the sidewall of the tire. Overloading can cause overheating, damage to the internal structure, and tire failure.
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The table below defines the speed capabilities of the wheels. Speed ratings are determined to match the speed capabilities of tires to the high speeds of the vehicles in which they are used. The speed rating does not indicate the speed of the vehicle and only indicates the maximum capacity of the tire.
Regardless of the speed capability of your tires, never exceed the legal speed limit or speed dictated by driving conditions. Exceeding the tire’s speed capacity can cause overheating and sudden tire failure.
Car mud, snow, ice, etc. if it is stuck inside and the wheels are spinning, do not allow the speedometer reading to exceed 35 mph. With only one wheel spinning on an axle, its speed will be twice the speed indicated on the speedometer, and it will quickly exceed the tire’s capacity. Do not allow anyone to stand behind the spinning wheel while attempting to push the vehicle. Speed and force can cause a tire to burst or explode, causing property damage, serious personal injury, or death to you or someone nearby.
A tire can only do its job if it is inflated to the weight of the vehicle. Car manufacturers specify a tire size with a specific tire pressure to carry the weight of the vehicle and passengers and provide the best balance of handling, traction, fuel economy and durability. This inflation pressure is different from that shown on the sidewall. The sidewall indicates the maximum pressure for the tire and the corresponding load, but the recommended pressure can always be found on the placard on the driver’s door panel.
Understanding How To Read Tire Size
If the tire size changes, the correct inflation pressure will be recommended to maintain the same amount of load. Higher inflation pressures provide higher load capacity, so light-duty passenger tires have a maximum load pressure of 35/36 psi, and extra-load passenger tires have a maximum load pressure of 41/42 psi.
Over-inflating and/or overloading a tire causes overheating and damage to the internal structure. Over-inflation increases the risk of tire cuts, punctures or bursts during a sudden impact. These conditions could result in tire failure, including tread/belt separation, which could subsequently result in an accident, serious personal injury, or death. This question creates confusion and stress for new drivers or some of our customers. Not everyone remembers their tire size or knows where to look for that information, and that’s okay! That is why we are here; No need to stress, you can trust our experience.
If you’re curious and want to understand the language, here are some basic tips on where to find this information on your car and what certain terms mean.
Aspect ratio measures sidewall height as a percentage of tire width. For example, a 205/65 R16 tire has an aspect ratio of 65, meaning the sidewall height is 65% of the tire width.
Can You Use Tires With Different Aspect Ratio Or Tread?
Tire width is measured in millimeters from sidewall to sidewall and is shown in the first three digits of the tire size. Here the wheel width is 205 mm.
Rim diameter refers to the rim size (in inches) measured from rim to rim across the face of the tire and determines the rim size the tire can fit.
The tire load index indicates how much weight your vehicle can safely carry based on tire size and pressure. The higher the load index, the more weight the tire can carry.
A tire’s speed rating indicates the fastest speed it can handle before it no longer functions as intended. Here, V = 240 km/h!
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You can enter our site and search by car. By selecting the year, make, model, and submodel of your vehicle, our site will provide you with the tire size included as original equipment on your vehicle. You’ll never be at a loss to choose the right tire again! I’ll give you simple and easy tips for reading and understanding tire sizes, what they mean, and the replacement time most drivers care about.
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