They start life as the base street wheel and machine exrtra material off them to lessen the weight, since they are then load tested, but not applied for expensive DOT testing, and approval, they, Pansport, has to claim "off road use only", you should be able to look ant them, on the back side and see additional machining, when compared to the street version.
At VTO we went another route, we made all the wheels as light as it took to pass DOT load testing, and then had the entire line DOT approved, so the wheels could be used for street, or race . Our Classic 8s, and in some case the Retro 4 as well, in a given size are the same weight, or lighter as the Panasport race wheel, and cost less. Most of our offset though are aimed at RWD, and we don't have a wheel that works on the prod Miata, and doubt we will ever do one, too deluted of a market, they already have tons of wheel choices for those cars.
