IMSA's 5 competition classes, explained | Hagerty Media

[Hagerty]

Sports car racing can often be overwhelming and confusing for a first-time watcher. In Formula 1, NASCAR, or IndyCar, you can differentiate cars simply by number and livery; in sports car racing, you're usually confronted with multiple classes of cars racing on the same track at the same time. "Who's winning?"
https://www.hagerty.com/media/motorsports/imsas-5-competition-classes-explained/

[OldCarMan]

Seems like they have to combine disparate classes to make a large enough field. That seems like maybe they are splitting hairs too much. It also makes watching and following a race too hard, given the constant cutting by the cameras. Not that much fun to watch as a single spec series.

[Historian]

Watching racing between these billionaire and millionaire owned cars is much like watching polo. Boring!

[CarlJensen]

Great article. Thanks for assembling. Its good to have a summary on the classes as they evolve from year to year. My favorite place to watch IMSA is Road America...Thundering speeds and fabulous racing!

[Billthecat707]

Don't see why you need 2 GT classes if your going to neuter the engines and set a single weight. Just give them all the same tire and power and make it a more interesting and easily understood class.