Dazzling Images from Ottawa Climax
Athletes power out of the gates in freezing cold Ottawa.
The stunning track started up high and dropped down into the locks of Rideau Canal.
Many thousands of fans braved temperatures of -20C to watch the action.
Even Justin Trudeau, the Prime Minister of Canada and a big Ice Cross Downhill fan, was mingling with the crowds.
A tough track tested the riders to their limits.
A view from the start gates as riders leap into action.
Scott Croxall was in brilliant form, powering his way to the men's final with ease.
With her title rivals failing to shine, Jacqueline Legere went into the women's final knowing a win would seal the world championship.
And win she did, surging clear of the other finalists to become champion for the second year in a row.
Legere celebrates with her trophy after the race.
Scott Croxall knew a win would give him back the title he lost to Cameron Naasz 12 months ago.
The other riders watched on nervously in the athlete's tent.
But it was Naasz who grabbed the lead early on, while Croxall crashed heavily on the first turn.
Despite a slip himself near the end, Naasz cruised over the line to make history by becoming the first back-to-back world champion.
The unstoppable American celebrates with his trophy after a thrilling final night of racing.