What is “Bare Rubber”?

Bare Rubber refers to a class of tires.  These tires must not have any traction modifiers in them.  Just the bare rubber on the ice.  Street division drivers run the tires they drive to the events on, typically all seasons or other daily driving tire compounds.  Pro Street and Competition are allowed to run tires that are designed for ice driving or tires that have a very soft rubber compound.  You can check the rule book for more specifications on these classes.