To determine if your tires are radial or cross ply, check the sidewall markings. Radial tires typically have "RADIAL" or "R" in the size designation, while cross ply tires may have "B" for bias or lack the radial designation altogether. Additionally, radial tires have a more flexible sidewall and a flatter tread profile, whereas cross ply tires usually have a more rounded profile and stiffer sidewalls. Inspecting the tire's construction can also reveal its type, as radial tires have layers of fabric running perpendicular to the tread, while cross ply tires have layers that crisscross.
Cross ply tires have advantages such as better load-carrying capacity, stronger sidewalls, and more resistance to punctures compared to radial tires.
Cross-ply tires have advantages over radial tires in terms of better load-carrying capacity, improved puncture resistance, and lower cost.
Legality has nothing to do with it. Safety is what you should be concerned with. You should never ever mix Bias & Radial tires on the same vehicle. This will cause the vehicle to handle in an unsafe manner. The handling characteristics of Bias Ply and Radial Ply tires is so very different that it is unsafe to mix them.
Cross ply tires have advantages over radial tires in terms of better load-carrying capacity, improved resistance to punctures, and a smoother ride due to their stiffer sidewalls.
Radial tires are worlds beyond bias ply tires. In radial tires, the steel chords are placed in a criss-cross pattern. Whereas bias ply tires are placed flat across the face of the tire. Bias ply tires are much, much harder for the engine to turn and are much harder for the suspension to compensate for. Bias ply tires are almost no longer used. That goes for America at least.
manufacturing process of bias & radial tires
Radial ply tires and tubeless tires are made from rubber, fabric, and steel.
Bias ply Tires (called cross ply in the UK) due to the construction of the internal belts actually had the trad squirm as the tire went around. Radial tire construction corrects this problem. Radial tires are also made of more advanced "Rubber" compounds that wear better
Radial tiers have a lower rolling resistance than previous types of tire Resistance is energy, in tires resistance creates heat. Radial tires construction and the materials they are made of create less heat and roll easier. And if you need a more detailed explanation you need to look at Bias Ply tires (called Cross Ply in some countries) and Radial tires to see why it makes a difference
Radial tires are better for freeway/street driving. They grip the pavement better and have better gas mileage. Cross ply tires are good for off-roading and any other kind of rough travelling.
The Simple answer: Radial Tires Roll down the road easier. How and Why is quite complicated
Bias ply tires get a flat spot from sitting but I have yet to see a radial tire do that.