Princess Auto - Unsure whether to use a bias-ply or radial tire on your trailer? It all depends on how you use it. For long road trips, regular trailer use = RADIAL
Difference between Radial and Bias Tyres? All You Need to Know
Bias Ply or Radial--What's Right for your Ride?
Radial Vs Bias Ply Tires (What is the Difference?)
BIAS PLY VS RADIAL PLY: WHAT IS THE DIFFERENCE? - Milestar Tires
tire - Why are almost all bicycle tyres cross-ply/bias ply and not radial construction? - Bicycles Stack Exchange