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What is the Height Difference Between ST22575R15 Load Range D and Load Range E Tires

Question:

OUR TRAILER CAME WITH OEM GOODYEAR MARATHON ST225/75R15 LOAD RANGE C. I REPLACED THEM FOUR YEARS AGO WITH GY MARATHON ST225/75R15 LR D. I BELIEVE THE LR D WERE .5 inch TALLER THAN THE LR C TIRES. IT IS TIME TO BUY NEW TIRES, I WANT TO USE THE GOODYEAR ENDURANCE TIRES. CAN YOU TELL ME HOW MUCH TALLER A GOODYEAR ENDURANCE ST225/75R15 LOAD RANGE E WOULD BE OVER A GY MARATHON ST225/75R15 LOAD RANGE D?

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Expert Reply:

The ST255/75R15 digits actually refer to the external dimensions of the tires. Since your Goodyear Marathon tires have the same size as the Goodyear Endurance ST225/75R15 # 724857519 they will have the same section width of 8.78" and overall diameter of 28.31".

The 1/2" difference you saw in height from the load range C to load range D tires could have simply been the difference in how much air pressure they had at the time or even the tread wear.

Attached is a review video for you to check out.

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Jon G

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