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A radial tire is constructed with the steel belts of the tire running at a 90 degree angle of the tread center line.
Radial tires run cooler. They're steel-belted, which results in a tougher overall construction, a longer tread life, and a wider footprint.
A bias ply tire is constructed with the nylon belts of the tire running at 30-45 degree angle of the tread center line.
Bias ply tires feature crosshatch construction, which provides stronger & tougher sidewalls. Due to the design of the tire's construction,
bias ply tires want to roll straight, as the trailer itself often does. Bias ply tires are generally less expensive.