Zenith Racing Series: ZR4

The Zenith Racing Series is an endurance racing championship comprising four classes that run prototypes and production-based machinery, with most cars shared between multiple drivers during races. The strongest class, ZP2, fields entry-level professionals in prototype machinery; the remaining classes are populated primarily by semi-professional and amateur competitors. The series draws drivers from American Endurance Racing and a cohort of peer-level amateur and regional competitions including NASA, IMSA Pilot Challenge, SCCA Majors, and SCCA Runoffs. Top drivers contesting the series include Linus Lundqvist and Hampus Ericsson. The field overall sits above most of its peer series but substantially below IMSA Pilot Challenge, which is the dominant professional endurance feeder in North America; Zenith serves as a stepping stone from amateur regional racing into American Endurance Racing and professional sportscar competition.