Readers ask: What Do The Letters Mean On Tires?

What do the letters stand for on tires?

The number is the load rating, or the amount of weight that it can handle. The letter is the speed rating, or the maximum speed the tire is built for. As an example, a tire rated 90R could safely carry 1,323 pounds and travel at 106 mph.

What does the P and R mean on tires?

P identifies your tire as a Passenger Tire. The P stands for PMetric. R indicates the construction used within the tires casing. R stands for radial construction. B means belted bias and D stands for diagonal bias construction.

What does the last number and letter mean on a tire?

The last grouping of characters, tied to the tire type, size and construction, represents the load index and speed rating. Also known as the service description, the number indicates the maximum load the tire can support when inflated properly, and the letter represents the maximum speed capability of the tire.

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What does 265 70r17 115t mean?

This number means that your tire has an aspect ratio of 70%. In other words, your tire’s sidewall height (from the edge of the rim to the tire’s tread) is 70% of the width. In this case, the sidewall height is 0 millimeters.

What does the Z mean on tires?

A “ Z ” rating can mean different things. While it nearly always means a high performance tire for high-performing sports cars, “ Z ” may actually appear in the middle of a tire’s size information. When it does, it represents either a maximum speed of more than 149 mph (240 kph) or 186 mph (300 kph).

Can I use 235 tires instead of 225?

Yesthat size will work 100% perfectly, as it is the exact same diameter as the 225 /75-16. 235 /70-16 is actually a shorter tire.

Do XL tires ride rough?

The XL tires have a stiffer sidewall and will ride a bit more ‘ rough ‘. Probably will respond quicker too as they have stiffer sidewalls.

What does the T or H mean on tires?

All these ratings cover speeds well above legal limits. The most popular, S, T, and H, are rated for 112, 118, and 130 mph, respectively. Traditionally, most family cars have used S- and T -rated tires, while tires rated H and higher have mostly been available only in sports cars or upscale sports sedans.

What is the difference between P and LT on tires?

There are two designations for truck, CUV, and SUV tires: Passenger ( P ) and Light Truck ( LT ). Passenger tires are designed for use on lighter weight vehicles such as regular passenger cars, minivans and CUVs. LT tires are designed for heavier vehicles like larger trucks, SUVs, and vans.

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What does XL mean on a tire?

Reinforced or XL (Extra Load) tires are specially reinforced tires. They can carry heavier loads than tires of the same size.

Can I use 215 tires instead of 205?

Nope. The nominal diameter of the 215’s is 1.7% greater than that of the 205’s. The sidewall height is a percentage of the width of the tire, so a 55 series is taller with a wider tire.

How tall is a 17 inch tire?

17 INCH TIRES TIRE HEIGHT
225 35 17 23.20
245 35 17 23.75
315 35 17 25.68
335 35 17 26.23

How tall is a 315 70R17 tire?

Plus Sizes

265/ 70-17 315 / 70-17
Diameter inches (mm) 31.61 (802.8) 34.36 (872.8)
Width inches (mm) 10.43 (265) 12.4 ( 315 )
Circum. inches (mm) 99.29 (2522.07) 107.95 (2741.98)
Sidewall Height inches (mm) 7.3 (185.5) 8.68 (220.5)

Are wider tires better?

From a safety point of view, both types have their good sides: On a dry road, wider tires will offer more grip than narrow ones, but the risk of aquaplaning will be higher with wide tires. – In the winter, narrow tires are better under extreme conditions as they provide higher surface pressure against the road.

What does 65 mean on a tire?

The two-digit number after the slash mark in a tire size is the aspect ratio. For example, in a size P215/ 65 R15 tire, the 65 means that the height is equal to 65 % of the tire’s width. The bigger the aspect ratio, the bigger the tire’s sidewall will be.

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