How can you tell if your tires are radial or cross ply?

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.