ROSARIO, Argentina: Toby Price has become the first Australian to win a category of the Dakar Rally.

Price finished fourth on the 13th and final stage of the world's toughest off-road race to easily finish top of the overall bike standings.

The 28-year-old from Singleton in the Hunter Valley started the day more than 37 minutes in front and finished the 180km stage to Rosario in Argentina in 1:55:49 to extend his lead by more than two minutes and win the bikes section by 39:41.

"I don't know what to say, I don't know what to think. I'm in shock," Price said after taking the chequered flag.