Difference Between P225/70R15 and P225/75R15 Tire Sizes

Question:

What is the difference between P225/70R15 and P225/75R15? Which is better choice? Thank you

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Expert Reply:

A P225/70R15 is about 27 inches in diameter while a P225/75R15 is about 28 inches in diameter. They are both nearly 9 inches wide and fit a 15 inch wheel.

Both of the tires you mention are passenger vehicle tires as shown by the letter P before the size. The difference between trailer and passenger tires is the flexibility of the side wall. Trailer tires are designed to withstand the downward force of a trailer load while passenger tires have a softer side wall to create a more comfortable ride for passengers.

If you need a trailer tire, I recommend ST225/75R15 Goodyear tire part # 724857519. The Goodyear tire provides better traction then the other trailer tires available because of the tread design. The Goodyear tire tread design has shorter ribs with breaks that allow water to run off to the side compared to the other tires that have long continuous ribs without breaks in the design. I do not know how much your trailer weighs but the larger ST225/75R15 has a maximum load capacity of 2,830 lbs at 80 psi. Higher capacity tires can run cooler and last longer.

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