Meanwhile, in a tire labeled 180/65 B1, the B indicates bias-ply construction. While these tires may look similar in size, ...

Somewhere between the early tires forged by wheelwrights and the modern steel-belted radial, everyone’s horseless carriage rode atop bias-ply tires ... Full-size tires were subjected to ...

Bias-ply tires have lots of rubber and soft sidewalls ... They feature an “R” in the tire size descriptor, indicating as such. “They’re simply the best of both worlds,” Millsaps said.