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Standard rubber has hardness 55-60 (+/- 5) ShA
The most popular polyurethane (PU) in the market are PU 75 ShA and PU 90 ShA.
So PU is harder than rubber in 35-60%.
It's has lower friction coefficient and it is much more long-lasting material.
But it also has squeak in humidity and can be broken more easily.
So there is no clear answer with benefits of use just for simple driving
(while professionals use it widely in race).
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