Replacement Boat Trailer Tires for Tire Size B78-13ST

Question:

I have a boat trailer I am wanting to put new tires and wheels on. Right now it has Sport Trax size 7.38-13ST. What would be the equivalent size? Thank you

asked by: Andrew S

Expert Reply:

For a B78-13 trailer tire, the closest match we will have will be a 185/80-13. We have numerous tires and tire and wheel combos in this size and I have included a link to them for you. All of the wheels have the 5 on 4-1/2 bolt pattern like # AM3S331 so make sure that is a match to your old wheels. I have linked an FAQ article on determining bolt pattern for you.

Please keep in mind that going to different tires and wheels will not increase the capacity of the trailer. Always inflate trailer tires to the maximum psi rating as indicated on the tire. And make sure that you have the space all around the old tires for the new size. A 185/80-13 trailer tire will measure 7.289 inches wide and will be 24.4 inches tall.

expert reply by: Michael H