Re: Tire size comparison.

Posted by Fish'n Jim On 2013/12/30 14:31:58

Agree, the polyester cords in bias and the bias lay-up design leads to more "flat spots". The rubber compound was also very different and that contributed. They used to have to "heat up" to get pliable. I never did like the bias tires living north then.
"Modern" radial tires have many advanced materials in them and each manufacturer has different strategies on compound. Loosely, wet grip is softer and high mileage is harder (durometer) Used to supply polymers to them for various functionality.
The technology outstrips the science. When I was in graduate school my math proof, for his PhD dissertation, derived and solved the bias ply tire stress equations, ten years after radials were on the market...