Replacement Trailer Tire for a F78-14 Tire

Published 11/28/2014

Products Featured in This Question

Loadstar ST205/75D14 Bias Trailer Tire - Load Range C

(3869)

$103.43

Karrier KR03 ST205/75R14 Radial Trailer Tire - Load Range C

(2323)

$127.09

Question:

I have a boat trailler that needs new tires. The tires I have are Sport Trax brand F 78 14st. Do you have this tire or its equivalent? If you do how much are they?

asked by: Daniel B

Expert Reply:

The correct metric size for the F78-14 tire size is an ST205/75-14 tire size. The part # AM1ST86 that you referenced will work as a replacement, but since this is a bias ply tire the part # AM10234 would be a better choice for you. The prices are available below at the links.

The main difference between a radial ply and a bias ply tire is how the tire is constructed. The cords inside a bias ply tire run at a 32 degree angle to the direction of travel, and the cords on a radial tire run at a 90 degree angle to the direction of travel, or across the tire from wheel lip to wheel lip.

A radial tire flexes more than a bias tire, giving it better ground contact, traction, stability, and tread wear.

A radial tire will normally run cooler than a bias ply tire, especially when the tire is under a load. A tire that runs cooler will last longer.

expert reply by: Jameson C