Fernando Alonso and Renault end Michael Schumacher and Ferrari's run of titles • Michelin teams pull out in US GP debacle, as Schumacher takes his only win of the year • BAR banned for two-races fuel cell infringement • GP2 replaces F3000 as F1's main feeder series, Nico Rosberg beats Heikki Kovalainen to the inaugural title • Nation-versus-nation series A1GP Series launches • McLaren signs world champion Alonso for 2007 before 2005 is even over • 2001 WRC champion Richard Burns dies after battle with a brain tumour • F1 introduces two-part aggregate qualifying system but abandons it mid-season, and also bans mid-race tyre changes for one year only • Tom Kristensen takes record seventh Le Mans win, again with Audi • Danica Patrick ignites IndyCar by leading the Indy 500 in her debut season, Dan Wheldon wins the race and the title • World Touring Car Championship is revived with Andy Priaulx the champion for BMW • Current AUTOSPORT editor Andrew van de Burgt takes the helm
- Fernando Alonso becomes Formula 1's youngest world champion, aged 24
- Michelin-shod teams pull out of the US Grand Prix, leaving just six cars racing at Indianapolis
- Tom Kristensen takes a record seventh Le Mans victory
- The BAR team is banned for two races for a breach of fuel tank regulations
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