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What Does The 113/108M Represent On the Sidewall Of My ST225/75R15 Tire?  

Updated 10/25/2021 | Published 10/23/2021

Question:

What does the number 113/108m mean on trailer tire st225/75r15

1

Helpful Expert Reply:

The 113/108 M that you are finding on the tire like the Karrier ST225/75R15 Radial Trailer Tire # AM10256 is referencing the load rating and speed rating of that particular tire.

The first number 113 represents a 2,535lb weight capacity per tire when used on a single tire axle.

The second number 108 represents a 2,205lb weight capacity per tire when used on a dually tire axle.

Finally the M is the speed rating of 81mph.

expert reply by:
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Bud M
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