|
The problem with arguing rubber "hardness" and trying to relate it to rolling resistance is that tread rubber compounds have a three dimensional relationship between rolling resistance, tread wear, and traction - and unfortunately "hardness" is only 2 dimensions.
So you can have a "hard" compound that has high rolling resistance, poor traction, but good treadwear and a "soft" compound that has high rolling resistance, good traction, and poor treadwear.
In other words, you can't relate hardness to rolling resistance.
(And BTW, you can't relate rolling resistance to traction or grip either)
|