What does the D or R mean on tires?

What does the D or R mean on 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 radial tire will normally run cooler than a bias ply tire, especially when the tire is under a load.

What is the difference between 205 75D14 and 205 75R14?

The difference between them is the tire’s type of construction. The ST205/75D14 tire is a bias ply type with a Load Range D rating. The ST205/75R14 tire is radial type that will typically run cooler than a bias ply and this means it will be likely to last longer.

What does D mean in tires?

The D is the designation for the internal construction of the tire. The D stands for diagonal or bias ply construction. That means the tire body plies inside the tire will crisscross. The 15 is the wheel diameter in inches and the C after the tire size will designate the load range.

Are D or R tires better?

Bias tires are less expensive. Radial tires, however, do perform better than bias tires, and that performance is quickly noticeable. The ride is smoother, the trailer does not bounce and sway as much, and radial tires have a longer life.

Can I mix R and D tires?

Expert Reply: It’s fine to use a radial-type tire as a spare (a tire with “r” in its size code) with a trailer that has Bias ply “d” tires but for a short distance in the event of a flat tire. But mixing tires is not recommended for everyday use because their internal construction is different.

What is the difference between ST205 75R14 and ST215 75R14?

The ST215/75R14 tire size is larger in diameter/height by just about 0.6 inches and larger in width by about 0.4 inches when compared to your existing ST205/75R14 tires. The larger size will also have a higher load capacity, as this particular tire features a maximum load of 2,200 pounds at 65 psi.

What is the difference between load range C and D?

The difference between an load range C and load range D tire in the same size is the capacity and psi rating. The D rated tire has a higher capacity. For a ST175/80D13 like # AM1ST77, the capacity is 1,610 pounds at 65 psi. For a C load range in the same size, like # AM1ST76 , the capacity is 1,360 pounds at 50 psi.

What’s better radial or bias?

Radial tires dissipate heat better than bias-ply tires, which allows them to travel at higher speeds for greater distance. “Due to a rigid tread, single steel body ply construction and the absence of multiple nylon plies, radials are much more effective at reducing heat,” says Mills.

Which TYRE is best radial or normal?

Two types of tyres are being used today – radial and bias. Radial is much more common these days. However, bias tires are also being used….A Comparison Between Radial & Bias Tires.

Radial	Bias
More fuel-efficient	Less fuel-efficient
Expensive	Cheap
Excellent Traction	Weak Traction
Increased Durability	Less Durable

What is the best load range for a trailer tire?

Special Trailer Service Tires

ST-Metric Trailer Service Tires
Load Range	Ply Rating	Maximum Load Pressure
B	4	35 psi (240 kPa)
C	6	50 psi (350 kPa)
D	8	65 psi (450 kPa)