Analysis written from the index itself — 40,700 drivers and every race behind them. Ratings, championship form, series strength, and the occasional argument about how a season should be read.
Endurance cars are shared by two, three or four drivers. How stints and driver changes work, why the split between drivers is rarely even, and the rules that stop one driver doing everything.
A ranking of 105 racing series by the median rating of every driver who has raced in them since 2024. Formula 1 is first by more than 900 points. What else ranks high, what ranks low, and what a ranking like this cannot tell you.
Pro-Am classes put a professional and an amateur in the same car. How the pairings are defined using FIA driver grades, who actually fills the seats, and which championships run Pro-Am classes.
GT3, GT4, GTE, GTLM, GTD and LMGT3 are different names for overlapping things, and some of them no longer exist. A plain guide to which is which, which series use them, and what changed in 2024.
Green, yellow, red, blue, black, the meatball and the rest. What each racing flag means, what a driver has to do about it, and where F1, NASCAR, IMSA and club racing disagree.
A guide to the American club road racing organisations, what separates a Regional from a Majors from the Runoffs, and where the strongest amateur fields actually are.
Spec racing puts everyone in the same car so the driver is the variable. Here is how it works, what it costs you in variety, and the numbers behind Spec Miata being the largest class in the country.
A win in Formula 1 and a win in a club race are both wins. Here is why that makes cross-series driver comparison difficult, and the four problems anyone building a rating has to solve.
The FIA grades every sportscar driver Platinum, Gold, Silver or Bronze. Here is what each one means, how a driver gets one, and what 7,760 graded drivers in our index show about how well the grades track speed.
Barber Motorsports Park has hosted 372 indexed races since 2004 across 27 series. Here are the drivers with the most wins there, which championships visit, and what the record shows.
The 2026 Mustang Challenge North America season finished at COTA on 6 September. Final standings for both classes, plus the penalty that changed the last race.