The Trail Ninja, Dan Milner is on the Spanish island of Gran Canaria to ride the punishing route of the Trans Gran Canaria running race. As if riding up, across and over the steep slopes of the island is not adventure enough, the Trail Ninja, Dan Milner, uses this MTB epic as an experiment to see which wheel size – 26, 27.5 or 29 inches – is best for mountain biking. One ring to rule them all? Three days of ultimate enduro riding delivers the result, sort of. All filmed on his GoPro camera.