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In an IMSA WeatherTech Championship race, the car first across the finish line is not necessarily the winner of every class. GTP, LMP2, GTD PRO and GTD have separate class standings and championships, so follow a car against its same-class rivals as well as watching the overall order. Knowing which class a car belongs to makes the traffic—and the race—much easier to read.
What do GTP, GTD PRO and GTD mean?
These labels identify different competition classes sharing the same circuit. IMSA’s 2026 regulations recognize separate GTP, LMP2, GTD PRO and GTD class championships; the classes present can vary by event. The key distinction for a viewer is that GTP is prototype machinery, while GTD PRO and GTD use the same GT3-based cars but have different driver-eligibility rules.
| Class | What the cars are | Driver eligibility and context |
|---|---|---|
| GTP | Grand Touring Prototype cars. IMSA describes GTP as the grid’s fastest class and says its cars have hybrid powertrains. The class debuted in 2023. | A separate prototype class. IMSA’s GTP description focuses on the cars; the GTD-versus-GTD PRO driver-rating distinction does not apply here. |
| GTD PRO | Grand Touring Daytona Pro; FIA GT3-specification cars. | Driver selection is open under the distinction IMSA explains. The class is associated with professional GT competition, but that does not mean every entry is a factory team. |
| GTD | Grand Touring Daytona; the same FIA GT3 car specification used in GTD PRO, with standardized Michelin tires. | Each entry must include at least one FIA Silver- or Bronze-rated driver, according to IMSA’s class explainer. GTD is not simply an amateur-only class. |
| LMP2 | A separate prototype class that may also appear in the WeatherTech field. | Check the event entry list to see which classes are present; not every weekend has the same mix. |
The table’s driver rules capture the practical difference between GTD and GTD PRO: GTD has a minimum driver-rating requirement, while GTD PRO leaves driver selection open. IMSA’s 2021 GTD PRO launch announcement described customer, Pro-Am and Am-Am lineups as possible in either class; the later class explainer gives the driver-rating requirement as the more precise distinction to use when following the current format.
What is the difference between GTD and GTD PRO?
They race the same type of FIA GT3 car, but they are separate classes. The difference is not that one has a fundamentally different GT3 specification: IMSA identifies driver eligibility as the dividing line. GTD entries must include at least one FIA Silver- or Bronze-rated driver; GTD PRO has open driver selection.
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That means a GTD PRO car and a GTD car can look nearly identical and may be from the same manufacturer, yet contest different class results. Factory support is common to the professional-GT context of GTD PRO, but it is not a rule that every GTD PRO entry is a factory team. Likewise, the Silver/Bronze requirement does not make every GTD driver an amateur.
How do I follow a multi-class endurance race?
- Choose a car to track. Use the event entry list or broadcast graphics to note its number, manufacturer and class. Fields vary by event, so do not assume every class is entered.
- Compare it with its class rivals. A GTP car passing a GTD car changes the visual order on the road, but usually does not decide the GTD car’s class position. Watch the class position or compare it with other cars in its class.
- Expect the track order to look mixed. Faster and slower classes share the circuit, and same-class cars can be separated by traffic, pit timing or caution periods. The order cars reach a corner is not a simple ranking of who is winning within each class.
- Re-check after stops and cautions. Pit cycles can reshuffle the apparent order. Traffic and the drivers currently in the cars also affect how GTD PRO and GTD interact. IMSA driver Bryan Sellers noted that long races bring a constant mix of traffic, pit stops and cycling; Antonio Garcia described the two classes as following their own pit plans even when strategies are alike.
- Use event-specific information. Pair the entry list with that event’s schedule and viewing guide. Available coverage varies by event and location; confirm the listed outlets for the race you are watching.
There can be “outside class” racing: a driver may have to negotiate another class’s battle while still pursuing a result in their own. Madison Snow, speaking to IMSA about getting caught among another class’s fight, said, “If you get in the middle of the other class battle, you don’t want to get them (mad),” underscoring that drivers must manage both their own contest and the traffic around them. These are driver observations, not additional class rules.
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Why are cars from different classes racing each other?
They share a circuit during the same endurance race, but the event awards results and championships within each class as well as an overall race position. The mix lets several categories compete in one event; it also means faster cars catch slower ones and must pass them while those slower cars continue racing their own class opponents.
For a concrete example, IMSA’s September 23, 2026 entry notebook for the 29th Motul Petit Le Mans listed 54 entries across four classes: 11 GTP, 11 LMP2, 14 GTD PRO and 18 GTD. Those numbers describe that event only, not a typical WeatherTech field.
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IMSA’s January 2026 sporting regulations describe a regulated regrouping during safety-car procedures. First, the prototype and GT categories split: GTP and LMP2 move right, while GTD PRO and GTD remain single-file and move left and back. A second split separates classes, placing GTP ahead of LMP2 and GTD PRO ahead of GTD. The intended restart order is GTP, LMP2, GTD PRO, then GTD.
This is a restart procedure, not a rule that the live overall running order always matches that sequence. The safety-car lights and race-control instructions determine when the split ends; the regulations prohibit overtaking from the designated conclusion of the procedure until the green flag.
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Where can I watch or listen?
Rights and outlets depend on the event and your location. For the 2026 Motul Petit Le Mans, IMSA listed Peacock flag-to-flag streaming in the United States, with NBC coverage from noon to 3 p.m. ET and NBCSN coverage from 3 p.m. to 10:30 p.m. ET on race day, Saturday, October 3. Outside the United States, IMSA listed an international feed on IMSA.tv and the IMSA Official YouTube channel. IMSA also listed selected sessions on IMSA.com and RadioLeMans.com, with live race coverage on XM 252 / Web-App 996. These are schedule details for that event, not guarantees for other races or territories.
That Petit Le Mans was scheduled to start at 12:10 p.m. ET and run for ten hours, according to IMSA’s event notebook. The event-specific listing is useful as an example of how to check a viewing plan; consult the current event guide for the race you want to follow.
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Sources
- IMSA, “Class Warfare: GTD PRO, GTD Cars Race Together Yet Separately” (March 19, 2024), on GT3 machinery, driver ratings and traffic interactions.
- IMSA, 2026 Sporting Regulations and Series Supplementary Regulations (January 2026 edition), including class championships and safety-car restart procedure.
- IMSA, “Enduring Race Pace: How IMSA Delivers Real-Time GTP Telemetry To The Fans” (July 9, 2024), on GTP’s hybrid powertrains, speed and 2023 debut.
- IMSA, “Entry List Notebook – Motul Petit Le Mans” (September 23, 2026), for that event’s field, schedule and viewing outlets.
- IMSA, “New GTD PRO Class based on GT3 specifications to launch in WeatherTech Championship for 2022” (January 28, 2021), on the class launch and intended positioning.
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