Speed Rating for Trailer Tire AM3S040

Updated 02/14/2017 | Published 02/13/2017

Products Featured in This Question

Loadstar ST175/80D13 Bias Trailer Tire with 13" Galvanized Wheel - 4 on 4 - Load Range B

(7786)

$135.21

Provider ST175/80R13 Radial Trailer Tire - Load Range C

(1113)

$101.48

Question:

What is the speed rating for these tires?

asked by: Frank S

Expert Reply:

The speed rating for the trailer tire part # AM3S040 that you referenced is 65 mph. If you wanted a higher speed rated tire we have the part # TTWTRTM1758013C which is rated for up to 81 mph. This tire is also a radial which is preferred to the bias ply tire you referenced.

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