What is the difference between ST205 75R15 and ST205 75D15?

The difference between the two tire sizes you mentioned is the construction of the tires. The R in the ST205/75R15 indicates that the tire is a radial. The D in the ST205/75D15 indicates that it is a bias-ply.

Which is better D or R trailer tires?

A radial tire flexes more than a bias tire, giving it better ground contact, traction, stability, and tread wear. A radial tire will normally run cooler than a bias ply tire, especially when the tire is under a load. A tire that runs cooler will last longer. For those reasons I would recommend an R tire over a D tire.

What does the D stand for in a trailer tire size?

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.

Which is better radial or bias tires?

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.

What is difference between R and D 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.

What is the difference between ST205 75R15 and st225 75R15?

The two sizes you mentioned are pretty similar and fit many of the same 15 inch wheels. The 205/75-15 fits rim widths of 5 inch to 6-1/2 inch whereas the 225/75-15 fits widths that are 6 inch to 7 inch. The 205 is 27.1 inches tall and the 225 is 28.4 inches tall. The 225 has higher capacities available for it as well.