Street Modified on Street Tires
The purpose of this class is to cater to street driven vehicles that may have one or two modifications that immediately places the vehicle into the “catch all” SM class; and for the competitor who does not intend to run on a National level, but to modify their car to their liking for the street.
With the exception of two additional rules, this class follows all of the normal Street Modified SCCA National Class rules. First, tires must have a treadwear rating of 200 or greater. Second, the PAX multiplier for the class shall be the current PAX of SM multiplied by 0.975.