Actualy the surface you race on determines the type of tyre you use mostly, and Tiverton was a level playing field as most if not all cars worked there within reason. When you start putting ruts, jumps and bumps in, that really tests things, whether it be on dirt, grass or astro.
The biggest difference in dirt and grass/astro is the grip level, on dirt, you are fighting to find grip, on high grip, it causes a whole different set of issue.
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