Organisers say the popularity of the IronMaori triathlon has grown so much, they've had to create a quarter IronMaori to meet the demand.
The event - traditionally a half ironman event - was set up in 2009 to promote fitness and wellbeing among Maori.
More than 2000 people have registered for the half IronMaori this December, with tickets selling out in 7 minutes earlier this year.
The co-founder of the event, George Mackey, says around 1200 competitors will take part in the quarter IronMaori, which will be held in Napier on Saturday.
He says the event includes a 10.5km run, 1km swim and 45km cycle.
Mr Mackey says the event is also designed for half IronMaori competitors to test their fitness.