[freebeard]

CapriRacer — You seem to know your tires. In the crowd I ran in (the undersize-the-end with-the-speeometer-cable one) the tribal wisdom is that the best tires were Klebers. When they opened an American factory and the tread pattern changed and the American-manufactured version 145s weren't 'as round'. Is roundness an actual thing? Don't they shave tires to concentricity?

It's easy enough to see that the surface and the weather all come to bear. I watched a Youtube video of a contest between a Tesla Model S and a Hummer starting and stopping on, and backing up an incline of solid ice. It wasn't a contest between the vehicles as much a between studded and unstudded but sipped tires.