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What Do The Letters On Tires Mean

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. Consult a load and speed index to find out what your tire’s specific rating means.

What does the T or H mean on tires?

The “T” or “H” on tires pertain to their speed ratings. A T-rated tire can withstand top speeds of up to 118 mph (190 km/h), while an H-rated tire can support up to 130 mph (210 km/h).

What does the letter P and LT stand for on a tire?

If there is a “P” on the sidewall, it stands for “passenger car.” This refers to the U.S. (P-metric) method of tire sizing. “LT” stands for Light Truck, “ST” is for Special Trailer and “T” stands for Temporary, which is primarily used for small spare tires.

What does the letter D mean on tires?

The D indicates that the tire is a diagonal bias ply construction and the R indicates that the tire is a radial tire construction. Beyond the size and type, there are load ranges for tires. Most trailer tires are load range B, C or D.

Can I use H-rated tires instead of V?

The rating is the speed the tire has been tested to for continuous safe driving. The English equivalent speed for H-rated tires is 130 mph and V-rated tires are good for up to 149 mph.

Which speed rating is better H or T?

The T or H part of the code indicates the speed rating of the tires. A speed rating of T indicates that the tire can be safely driven up to 118 mph. A tire with an H rating has a higher limit — 130 mph — which means it can be safely driven faster than the tire with the 94T code.

What is load range H?

From a G to an H Truck tires typically come in two load ratings: G and H. Load range G is a 14-ply configuration, while load range H tires have 16 plies. The heavier-rated tire will usually add between 700 pounds and 1,000 pounds more load-bearing capacity per tire (see “How Much is Too Much,” next page).

What does AP mean on tires?

AT vs All Purpose (AP) This is mostly because AP tires are capable of going off-road, but its smaller tread blocks and grooves allow mud to “stick” to the tire more.

Are all LT tires 10-ply?

The cords in a LT tire are a larger gauge than P-metric tires so the tire can carry heavier loads. LT tires are usually 8-ply (Load Range D) or 10-ply (Load Range E). Passenger Tires usually have a 4-ply or 6-ply equivalent sidewall.

Are 10-ply tires better?

In addition, some off-road drivers seek out Load Range E/10-ply tires because they provide extra layers of durability and sidewall protection, ideal for extremely rough off-road terrain. Higher load carrying capacity tires make towing easier because their stiffer tires help stabilize loads and reduce sway at speed.

Which is better D or R tires?

The difference between the two trailer tire sizes is that the letter D in the first size you listed ST205/75D15 stands for bias ply and the letter R in the tire size that they put on your vehicle stands for radial. A tire that runs cooler will last longer.

What does R and D mean on tires?

R indicates a radial tire — D indicates a Bias ply tire D is for diagonal. The sidewalls will flex differently. The radial tire should run a little cooler . Also a radial tire the same size as a bias ply tire should have a larger contact area where the tire meets the pavement because of the design .

What’s the difference between R15 and D15?

The R15 is a Radial tire and the D15 is a Bias Ply tire. These tires are usually a harder rubber and can carry more weight but not necessarily a smoother ride.

What does M’s mean on a tire?

149. All-Season Tires with Mud and Snow Designation. When a tire has M+S on it, that means that it meets the Rubber Manufacturers Association (RMA) guidelines for a mud and snow tire.

What speed rating is S?

TIRE SPEED RATINGS SAFETY Speed Rating Maximum Speed Q Up to 100 mph R Up to 106 mph S Up to 112 mph T Up to 118 mph.

What are W rated tires?

A relatively new addition to the speed rating chart, tires with speed rating “W” can achieve a maximum sustained speed of 168 mph (270 kph).

Does tire speed rating affect ride quality?

Speed Ratings Refer to More Than Just Speed Speed ratings affect more than just speed, they also contribute to ride comfort, wear, and cornering capabilities. In general, the higher the speed rating, the better the grip and stopping power, but the lower the tread life.

What does 100T mean on a tire?

Just after the tire size are some more numbers, commonly 100T. The 100 is the tire’s load index, and in the case of 100, it means by itself a properly inflated tire can hold up 800 kilograms (1,764 lb.).

What does Utqg mean on tires?

No, “UTQG” is not a play dictated by Peyton Manning during a Super Bowl huddle. The Uniform Tire Quality Grade is a comparative assessment applied to most car tires (excluding winter tires) to help consumers make informed decisions. The manufacturers grade the tires themselves for temperature, traction, and tread wear.

What load range is F?

Light Truck Tire Load Ranges Abbreviation Meaning Max Load Pressure LR/C Load Range C – 6 ply rated 50 psi LR/D Load Range D – 8 ply rated 65 psi LR/E Load Range E – 10 ply rated 80 psi LR/F Load Range F – 12 ply rated 95 psi.

What’s better load range D or E?

For a given brand and size tire, the load range E has a higher maximum load capacity than the load range D. The E tire is built and rated for 80 psig, while the D tire is (as I recall) built and rated for 65 psig maximum inflation pressure.

What ply rating is G?

14 Ply Rating Load Range 10 E 12 F 14 G 16 H.