This article needs to be updated.(January 2018)
In relation to motorsport governed by the Fédération Internationale de l'Automobile, Group R refers to a set of regulations providing production-derived vehicles for rally competition. The Group R regulations were created in 2008 as a gradual replacement for Group A and Group N rally cars. To comply with Group R regulations, a car must be homologated in Group A (or in some cases Group N) and receive one or more VR extensions. Each VR extension is a set of homologated parts and modifications, designed and sold (as a kit or as a complete car) by the manufacturer. As part of its structure, the Group R regulations have a provision for GT cars, known as RGT.
Classes under Group REdit
Group R consists of six classes, designated R1, R2, R3, R4, R5 and RGT; some of these groups contain their own sub-groups, with cars allocated to each group based on their weight, engine size and powertrain. The first batch of rules, introduced in 2008, featured R1, R2 and R3 classes, reserved to two-wheels drive cars with atmospheric engines up to 2000cc. Supercharged engines were allowed only in R3T (gasoline) and R3D (diesel) classes. Additional regulations were issued in 2011 covering R4 and RGT classes; the R4 was conceived as an evolution step for previously homologated Group N4 (turbocharged, all-wheel drive) cars. The R5 class, designed to replace Super 2000 cars, was introduced in 2013. Since 2015 the R1, R2 and R3 classes allow supercharged engines with a 1.5 equivalency factor for displacement.
Teams and drivers are sorted into a specific championship based on the class their car fits into. Cars classified as R1, R2 and R3 contest the World Rally Championship-3 for two-wheel drive cars; especially-prepared R3T cars are also used in the Junior World Rally Championship. Cars classified as R4 and R5 compete in the World Rally Championship-2 alongside existing Super 2000 and Group N Production Cars. Cars classified as RGT compete in the R-GT Cup.
|RC1||WRC||1600cc||Turbocharged||Petrol||1230 kg||Four-wheel drive||2500 per year||WRC-1||Citroën DS3 WRC|
|RC2||R5||1600cc||Turbocharged||Petrol||1230 kg||Four-wheel drive||TBA||WRC-2||Peugeot 208 T16|
|R4||Greater than 2000cc||Turbocharged||Petrol||1300 kg||Four-wheel drive||n/a||Subaru Impreza R4|
|RC3||R3T||Up to 1620cc||Turbocharged||Petrol||1080 kg||Two-wheel drive||2500 per year||WRC-3, JWRC||Citroën DS3 R3T|
|R3C||1600cc to 2000cc||Naturally aspirated||Petrol||1080 kg||Two-wheel drive||2500 per year||WRC-3||Renault Clio R3C|
|1067cc to 1333cc||Turbocharged||none|
|R3D||Up to 2000cc||Supercharged||Diesel||1150 kg||Two-wheel drive||2500 per year||Fiat Grande Punto R3D|
|RC4||R2B||1390cc to 1600cc||Naturally aspirated||Petrol||1030 kg||Two-wheel drive||2500 per year||Ford Fiesta 1.6 R2|
|927cc to 1067cc||Turbocharged||Ford Fiesta Ecoboost R2|
|R2C||1600cc to 2000cc||Naturally aspirated||Petrol||1080 kg||Two-wheel drive||2500 per year||none|
|1067cc to 1333cc||Turbocharged||none|
|RC5||R1A||Up to 1390cc||Naturally aspirated||Petrol||980 kg||Two-wheel drive||2500 per year||Toyota TMG Yaris R1A|
|Up to 927cc||Turbocharged||none|
|R1B||1390cc to 1600cc||Naturally aspirated||Petrol||1030 kg||Two-wheel drive||2500 per year||Renault Twingo RS R1|
|927cc to 1067cc||Turbocharged||none|
|RGT||No limit||Turbocharged or supercharged||Petrol||TBA||Two-wheel drive||TBA||R-GT Cup||Lotus Exige R-GT|
FIA has created a new R4 Kit class, with a standard engine, four-wheel drive powertrain and suspension. In January 2017, French racecar manufacturer Oreca was selected as supplier. The kit will cost 108,000 euros plus taxes, including a 1.6L 260hp turbo engine.
Until 2014 there was no specific championship for cars entered under RGT regulations, and RGT cars were ineligible to score points in any existing championship outside the World Rally Championship. The FIA R-GT Cup for RGT cars will start from 2015 sharing some events from the WRC and ERC events.
- Citroën DS3 R3T
- Fiat Abarth 500 R3T
- Fiat Grande Punto R3D
- Honda Civic R3C
- Peugeot 207 R3T
- Renault Clio III R3C
- Renault Clio IV R3T
- Toyota GT86 R3C
Based on Group N
- Toyota Etios R4 (Developed by Oreca) 
- Lada Kalina R4 (Digital concept by Oreca) 
- Dacia Sandero R4 (Digital concept by Oreca) 
- Nissan Micra R4 (Digital concept by Dytko Sport) 
- Toyota Yaris R4 (Developed by Evolve Sport) 
Official cars allowed in the WRC2
- Citroën DS3 R5
- Ford Fiesta R5
- Peugeot 208 T16 R5
- Škoda Fabia R5
- Hyundai i20 R5
- Citroën C3 R5
- Volkswagen Polo GTI R5 (Homologation scheduled for 2019)  
FIA approved, just for Regional Championships (CODASUR Zone, EWRC, APRC) and National competitions.
- Mitsubishi Mirage R5 
- Toyota Etios R5 
- Proton Iriz R5  (It will be submitted for international homologation in July) 
- Opel Corsa R5 
- "Specific regulations for cars in Groups R" (PDF). FIA.com. Fédération Internationale de l'Automobile. 19 May 2012. Retrieved 23 August 2012.
- Elizalde, Pablo (13 August 2012). "Toyota unveils entry-level WRC Yaris". Autosport.com. Haymarket Publications. Retrieved 23 August 2012.
Toyota said the car will be able to compete in the World Rally Championship under the R1A regulations once it is homologated by the FIA before the end of the year.
- "Specific Regulations for GT Production Cars" (PDF). FIA.com. Fédération Internationale de l'Automobile. 19 May 2012. Retrieved 23 August 2012.
- Paur, Jason (23 December 2011). "Lotus Shakes Down Its Rally-Spec Exige". Autopia. Wired. Retrieved 23 August 2012.
- Holmes, Martin (19 December 2011), The Return of the Rallying Sports Car, archived from the original on 26 April 2012, retrieved 23 August 2012
- "Exciting changes for 2013 WRC". WRC.com. WRC Official Website. 21 Sep 2012. Retrieved 1 Oct 2012.
- "Article 260 (2014) - Specific Regulations for Group R Cars - published on 11.04.2014" (PDF). fia.com. Federation Internationale de l'automobile. Retrieved 18 April 2014.
- "81e Rallye Monte Carlo 2013 Entry List" (PDF). rallye-magazin.de. Monte Carlo Rally. 20 December 2012. Retrieved 21 December 2012.
- "Junior WRC is where it's at, says top rally man". WRC.com. 6 December 2012. Retrieved 20 January 2013.
- R4 Kits for regional and national rally cars - FIA, 27 January 2017
- "WRC welcomes FIA R-GT Cup". WRC.com. World Rally Championship. 29 September 2014. Retrieved 2 October 2014.
- Fernischumi (3 April 2013). "Las categorías de los rallyes: Grupo N, RGT, R4, R3, R2 y R1 (2/2)".
- "Citroen DS3 R3 rally car for FIA Group R3T regulations". Paultan.org.
- Carlos Argüelles-Meres Cueto. "El Renault Clio R3T progresa adecuadamente". Archived from the original on 2013-11-29.