I have no idea what direction they'll run that day, but my lap times are about same both directions anyway. Indeed, the surface has always been one of the most abrasive, and feels like it got even more so in recent years. With my Z06, tires are gone in just a few days (front shoulders cord first).
Checking on hardening on the surface is also a bit tricky. Since tires collect rubber, I'm planning to get measurement from the wear marker holes' inside bottom. We'll see if it makes sense : p
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