I have heard the following analogy used when trying to explain why the narrow
tires work so well on the salt and on the dirt: Imagine the tire is a vee
grove type of fan belt, and the lake bed surface is the pulley. At speed
with full down force and weight on the tire, it digs into the surface of the
lake bed and forms a tire track, or groove which gives it more "surface area"
and tends to stabilaze the car.
Now that's more folk lore than engineering, however, it's food for thought.
Jim
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