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Replacement Tires For an Old Trailer With B or D 78-13 Tires

Question:

I have a old trailer with the I can tell is a B or D78-13 Or B or D 75-13 what will replace it? Thanks

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Expert Reply:

It is most likely a 78-13 as that was an old tire size that was discontinued. The closest replacement is a 175/80-13.

The B or D is in reference to the weight capacity of the tire.

A Kenda ST175/80D13 Bias Trailer Tire # AM1ST74 has a load rating B which is 1,100lbs per tire for this size.

The Karrier ST175/80R13 Radial Trailer Tire # AM10210 has a load rating of D which is 1,650lbs per tire.

To determine which will work better for your trailer you can determine what your GVWR is and ensure that the tires will be able to support that amount of weight.

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Gregory M

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