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What Size Trailer Tire Replaces an L78-15 Tire on a Boat Trailer

Question:

My trailer tire is a L78-15 b load range. what tire can I replace it with.

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Expert Reply:

A 78-15 is an older tire size and the metric equivalent is going to be either a 205/75-15 or a 225/75-15 depending on the capacity you need to match the old tires.

A 205/75-15, load range B, such as # AM1ST91, is rated for 1,480 pounds at 35 psi. A load range C, # TTWTRTM2057515C, is rated for 1,80 pounds at 50 psi. And a load range D, # AM10245 is rated for 2,150 pounds at 65 psi.

By comparison a 225/75-15 load range C, # AM10251, is rated for 2,150 pounds at 50 psi. A load range D, # TTWTRTM2257515D, is rated for 2,540 pounds at 65 psi. And a load range E, # AM10303, is rated for 2,830 pounds at 80 psi.

The 205/75-15 tires will fit wheels that are 5 to 6-1/2 inches wide (inside where the tire sits, not overall width).

The 225/75-15 tires will fit wheels that are 6 to 7 inches wide (inside where the tire sits, not overall width). I have included some helpful links on trailer tires for you.

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