James training in Switzerland for the Yukon Arctic Ultra. His bike has 15 cm wide tyres to prevent them sinking into the snow.
The Yukon Arctic Ultra is a gruelling 430-mile race from Whitehorse to Dawson City in the westernmost province of Canada. Since the race's inception in 2003, only one person has successfully complete the 430-mile mountain bike race: Alan Sheldon from England who finished in a time of 182:50 hours.
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