iRacing series guide: finding what to race
If you just opened the iRacing UI and stared at a wall of series, start with the Fanatec Global Mazda MX-5 Cup. It is free with your subscription, runs every 30 minutes, always fills multiple splits, and rewards smooth driving over raw pace. From there, the right next series depends on two things iRacing uses to sort every race on the service: category and license class.
How iRacing organizes racing: two axes
Section titled “How iRacing organizes racing: two axes”The five categories
Section titled “The five categories”iRacing splits all racing into five categories, and each one carries its own separate license and Safety Rating:
- Sports Car — closed-wheel cars with fenders (MX-5, GT4, GT3).
- Formula — open-wheel single-seaters with no fenders (Formula Vee, USF2000, F4).
- Oval — NASCAR-style left-turn racing.
- Dirt Oval and Dirt Road — the two dirt categories.
The old combined “Road” license was split into Sports Car and Formula, so a B-class Sports Car license tells you nothing about your Formula license. You climb each ladder independently.
License classes, Rookie to A
Section titled “License classes, Rookie to A”Classes run Rookie → D → C → B → A → Pro → Pro/WC. To leave Rookie you need your Safety Rating at 3.0 and your Minimum Participation Requirement (MPR) met — a set number of races completed that season — which triggers a Fast Track Promotion to D. After that, an SR of 4.0+ fast-tracks you up D → C → B → A, or you finish a season above the cut line. Series are gated by class: a C-class series needs a C license in that category, so the ladder decides what you can enter.
Where to start: the Rookie series
Section titled “Where to start: the Rookie series”Two Rookie series are free and worth your first month. The Global Mazda MX-5 Cup is the default pick — no driver aids, light and tossable, and the car most people in any sim call one of the best-driving cars made. Formula Vee is the open-wheel equivalent: a free spec single-seater that delivers some of the closest racing on the service. Run the MX-5 first if you are new to a wheel, because learning car control without ABS or traction control in a forgiving chassis transfers to everything above it. The Toyota GR86 rookie tin-top is the third common entry point.
Where to go after Rookie
Section titled “Where to go after Rookie”Graduating to D class opens the real ladders. On the Formula side, Cooper Tires USF2000 is the bottom rung of the open-wheel ladder and Skip Barber is the classic teaching single-seater. FIA Formula 4 is very popular but chaotic at low Safety Rating, so expect contact. On the Sports Car side, the Sim-Lab Production Car Challenge (GR86 + Global MX-5 multiclass) is a natural step up from the rookie tin-tops.
The popular mid-license series
Section titled “The popular mid-license series”C class is where most drivers find a home. GT4 (multiclass with LMP3) gives you ABS and traction control, which makes it the common next step from a road car. The Porsche 911 Cup runs no aids and races hard. TCR — Hyundai Elantra N, Audi RS3, Honda Civic Type R — is front-wheel-drive touring that saw a participation surge after its 2025 format change.
Then B class, and the answer to a question every new player eventually asks: GT3 is the single most populated racing on the service. New drivers assume open-wheel is “the” racing, but the Ferrari 296, Porsche 911 GT3 R, BMW M4 GT3, Mercedes-AMG, McLaren, Audi, and Lamborghini fields across IMSA, GT Sprint, and the Fanatec GT Challenge are where the largest grids and most splits live. In 2025 Season 4 iRacing added the GT3 Regional Tour (Americas, Europe, and Asia-Pacific), each with its own region-appropriate track calendar running hourly on the :45, alongside the existing fixed and open GT3 schedules. GT3 stays at or near the top of the population charts, but the same players are now spread across more parallel series, which diluted any individual split. If you are deciding which GT3 to buy, the cars and tracks to buy first guide ranks them.
Picking a discipline that fits you
Section titled “Picking a discipline that fits you”Open-wheel rewards precision and punishes contact harshly — light cars, no fenders, a mistake ends your race. Sports cars are more forgiving and have the deepest fields, which is why most drivers settle there. Oval looks simple and is the hardest to do well; consistency over 100+ laps in close traffic is its own skill. There is no wrong category, but the popular ones (MX-5, GR86, F4, GT4, GT3) split into multiple races at any hour, so you never sit in an empty field.
How to pick, and stop over-buying tracks
Section titled “How to pick, and stop over-buying tracks”Pick one series and follow it for a full season. The most common money mistake new members make is buying a generic “most popular tracks” list when each series only visits a handful of tracks per season. Buy tracks for the series you actually intend to race, and check a season week-planner first to find crossover so one track serves multiple weeks.
Once you have committed to a series, Startlight ($9.99 iOS app, Home Screen widget, and Apple Watch app) shows which session of that series is running now, what is next, and time-to-green, so you stop refreshing the schedule screen.
Series by license class: quick reference
Section titled “Series by license class: quick reference”| Class | Sports Car | Formula | Oval |
|---|---|---|---|
| Rookie | Global MX-5 Cup, GR86 | Formula Vee | Legends, Advance ovals |
| D | Production Car Challenge | USF2000, Skip Barber, FIA F4 | — |
| C | GT4, Porsche 911 Cup, TCR, LMP3 | Formula Ford 1600 | — |
| B | GT3 (IMSA / GT Sprint / Fanatec GT / Regional Tour) | — | NASCAR national |
| A | GTP/LMDh endurance | Super Formula, Dallara iR-18 | — |
Frequently asked questions
What's the most popular series to race in iRacing?
GT3 is the single most-populated racing on the service — Ferrari 296, Porsche 911 GT3 R, BMW M4 GT3, Mercedes-AMG, McLaren, Audi, and Lamborghini fields run across IMSA, GT Sprint, the Fanatec GT Challenge, and the newer GT3 Regional Tour. For a first series instead, the free Global Mazda MX-5 Cup runs every 30 minutes and always fills multiple splits.
Why was GT3 split into regional series, and did it hurt participation?
In 2025 Season 4 iRacing added the GT3 Regional Tour (Americas, Europe, Asia-Pacific), each with its own region-appropriate track calendar running hourly on the :45, alongside the existing fixed and open GT3 schedules. It adds track variety, but the same players are now spread across more parallel series, which diluted any individual split.
What's the best path from Rookie to GT3?
Climb the Sports Car ladder: Rookie MX-5 or GR86, then D-class Production Car Challenge, then C-class GT4 (ABS and traction control, multiclass with LMP3), then B-class GT3. Buy tracks only for the one series you're actually running at each step, not a generic most-popular-tracks list.
Should I start with open-wheel or GT racing in iRacing?
GT and sports cars are more forgiving and have the deepest fields, which is why most drivers settle there. Open-wheel rewards precision and punishes contact harshly — no fenders means a single mistake ends your race. Oval looks simple but is the hardest to do well over 100-plus laps in close traffic.