At the speedway where I grew up (Oswego Speedway 
http://www.oswegospeedway.com/), the raced what they would call "super 
modified" cars. One of the drivers showed me his car once and it looked 
to me like they pretty much would build the cars from the ground up.
Anyway, the tires on these cars had no tread on them whatsoever. It made 
me wonder why that didn't cause a problem getting a good grip on the 
pavement. I still don't know, but the racing tires looked completely smooth.
Like this:

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