ITU World Triathlon Series: Leeds event makes its debut
Some of the world's top triathletes and thousands of spectators are expected to attend the inaugural Leeds stage of the 2016 ITU World Triathlon Series.
Sunday's elite races will see a swim at Roundhay Park before a cycle into the city centre and a final run to the finish in Millennium Square.
About 5,000 amateurs will tackle a similar route earlier in the day.
Event organisers expect up to 100,000 people to attend, with several road closures in place throughout the event.
The West Yorkshire leg was officially placed on the 2016 series' calendar in May, replacing London as the UK venue.
World champion triathletes Alistair and Jonathan Brownlee, as well as Vicky Holland and Non Stanford are among competitors taking part in the elite races on Sunday afternoon.
Following a 1.5km swim section in Waterloo Lake, Roundhay Park, competitors will ride 41.5km through Roundhay, Moortown, Meanwood, Weetwood, Headingley, Woodhouse and the city centre.
Four laps of the city centre on foot, making up a 10km distance, will end at the finish line in Millennium Square.
Amateur event routes
Several amateur events will be taking place ahead of the elite groups, with the races separated into Olympic, Sprint and Beginner distances.
Roads around the routes are expected to close by 05:00 on the day of the event and will be shut for a minimum of 12 hours.
07:00 - 08:44 Open race Olympic distance start
09:13 - 10:21 Open race Sprint distance start
10:35 - 10:45 Open race Beginner distance start
13:00 - Elite women's race starts
15:45 - Elite men's race starts
Jack Buckner, chief executive of British Triathlon, said: "The amount of world class athletes taking part in the Columbia Threadneedle World Triathlon Leeds is truly outstanding.
"It's not often you get to see the world's best competing in the heart of the city."
He added: "We have a really strong British contingent racing in Leeds and I'm sure that the public will come out and cheer them on along the course, as well as giving the international athletes a rousing Yorkshire welcome."