Organisation
Historic Sportscar Racing
North America’s vintage and historic racing sanctioning body, founded in 1977 and now operating under IMSA.
Governed (10)
HSR B.R.M Chronographes Endurance Challenge
B.R.M EnduroHSR’s one-hour enduros for period-matched groups of cars, each with a mandatory pit stop.
HSR Classic Endurance Championship
Classic EnduranceHSR’s Mission Foods-backed endurance championship — the Classic 10 Hour, 12 Hour and 24 Hour — honouring IMSA’s endurance heritage.
HSR Historic Trophy
Historic TrophyHSR run groups 6 and 7 — historic sports and GT cars in WeatherTech sprint races.
HSR International/American Challenge
Intl/American ChallengeHSR’s production-car sprint: big-bore American iron against European sports cars, with International, American and Porsche classes.
HSR Legacy Racers
Legacy RacersHSR run groups 5, 8 and 11 — legacy-era sports and GT cars in WeatherTech sprint races.
HSR Mission GT Challenge
Mission GT ChallengeHSR run groups 9 and 10 — modern-era GT cars in sprint and enduro races.
HSR NASCAR Classic
NASCAR ClassicHistoric NASCAR stock cars racing on HSR’s road-course weekends.
HSR Prototype Challenge
Prototype ChallengeHSR’s modern-era prototype class, racing sprints and an enduro each weekend.
HSR Vintage Cup
Vintage CupHSR run groups 2 and 3 — vintage sports and GT cars in WeatherTech sprint races.
Historic Sportscar Racing
HSRNorth America’s premier vintage and historic racing series — seven major weekends a year at Daytona, Sebring, Road Atlanta and Watkins Glen.
Organised (10)
HSR B.R.M Chronographes Endurance Challenge
B.R.M EnduroHSR’s one-hour enduros for period-matched groups of cars, each with a mandatory pit stop.
HSR Classic Endurance Championship
Classic EnduranceHSR’s Mission Foods-backed endurance championship — the Classic 10 Hour, 12 Hour and 24 Hour — honouring IMSA’s endurance heritage.
HSR Historic Trophy
Historic TrophyHSR run groups 6 and 7 — historic sports and GT cars in WeatherTech sprint races.
HSR International/American Challenge
Intl/American ChallengeHSR’s production-car sprint: big-bore American iron against European sports cars, with International, American and Porsche classes.
HSR Legacy Racers
Legacy RacersHSR run groups 5, 8 and 11 — legacy-era sports and GT cars in WeatherTech sprint races.
HSR Mission GT Challenge
Mission GT ChallengeHSR run groups 9 and 10 — modern-era GT cars in sprint and enduro races.
HSR NASCAR Classic
NASCAR ClassicHistoric NASCAR stock cars racing on HSR’s road-course weekends.
HSR Prototype Challenge
Prototype ChallengeHSR’s modern-era prototype class, racing sprints and an enduro each weekend.
HSR Vintage Cup
Vintage CupHSR run groups 2 and 3 — vintage sports and GT cars in WeatherTech sprint races.
Historic Sportscar Racing
HSRNorth America’s premier vintage and historic racing series — seven major weekends a year at Daytona, Sebring, Road Atlanta and Watkins Glen.
