Sage-Tips

How do you calculate the weight of a tire?

Standard U.S. Tires Example: A tire size marked 11R22. 5 is 11 inches wide. 11 x 300 lbs = 3300 lbs per tire. 3300 x 4 tires per axle = 13,200 lbs.

What is the correct specification of a tyre?

205 indicates the normal section width of the tyre in millimetres (205mm). 65 indicates its aspect ratio, a comparison of the tyre’s section height with its section width (65 indicates the height is 65\% of its width). R indicates radial ply construction. 15 indicates the nominal diameter of the wheel rim (15 inches).

How do you calculate tyre load rating?

You’ll find the load rating of your tyre on the sidewall, just to the right of the diameter. For example, a tyre with a load index of 91 can carry 615kg of weight. Load ratings and speed ratings should be looked at together when you buy a new tyre. Also remember to check your manufacturer’s recommendations.

Is there a weight limit on tires?

The higher the tire-load rating, the more weight your tire can handle. However, do note that the tire load rating number itself is not the actual weight limit. For example, a tire-load rating of 105 means that these tires can handle a maximum-weigh capacity of up to 2,039 pounds (925 kilograms).

How do tires support the weight of a car?

They are squished at the bottom. The flat spot on the bottom where the tire meets the road is called the contact patch. For your 2-ton (4,000 lb) car, you will find that the area of the contact patch is about equal to the weight of the car divided by the tire pressure.

What does 75t mean on a tyre?

Radial construction.R stands for radial-ply construction. 387. 387 is the load index i.e. the maximum weight each tyre can carry at full speed. T is the speed rating i.e. the maximum speed for the tyre at full load.

What is maximum tyre load?

The tyre load rating defines the maximum load of a tyre moving at the maximum permissible speed. The load rating is expressed by a two or three-digit number and is located on the tyre sidewall. The manufacturer sets the maximum load capacity of the tyre, taking into account the most loaded axle of a vehicle.

How much do tires weigh?

You can expect an average passenger car tire weight to be about 27 pounds (12 kg), and about 30 pounds (14 kg) for the rim, or about 50 to 60 lbs in total.

How do tyre manufacturers determine tyre size?

Most tyre manufacturers follow an industry-standard method to state the information about each tyre, helping main dealers, independent garages, and personal buyers. Let’s take the tyre above as an example. The tyre size is: P205/65 R16 95V. The first number is the width of the tyre in millimetres. Therefore, this radial tyre has a width of 205mm.

How do I know if a tyre is compatible with my vehicle?

To be sure that a tyre is compatible with your vehicle, you should consult your owner’s manual or one of the above places. When in doubt, you can also get in touch with the Tyres on the Drive team. A tyre sidewall contains a lot of information. So, let’s start by focussing on the short sequence of letters and numbers which represent the size code.

What does the load rating on a tyre mean?

The load rating on a tyre converts to a maximum weight that each tyre is manufactured to support at a specified speed. The UK law requires the load rating to be equal to or higher than the tyre that is recommended by the vehicle manufacturer for the tyre size that is fitted.

What do tyre markings mean and why are they important?

Enter, tyre markings. These are used to identify the specifications and physical features of a tyre, so you can find a replacement which works in tandem with your vehicle. While a few of these tyre markings are of little importance, most of them have a significant effect on performance and safety – so it’s important to get right.