I am sure someone on a 250 Bultaco would just bumble up that without the been of stretched swinging arms or metal spikes in there tyres?
Some of these comps demand large capacity engines.....and are on slopes where you eventually lose both traction and momentum.
Im surprised no one was badly hurt. By the time they get near the top there is 6 foot jumps and 10 foot ledges. Impossible is right.
Looked fun, I remember running up sand dunes on bikes with paddle tires in 78-82. Due to the short range a good application for an electric bike maybe as it looked like some sections you needed slow than bring on the power. But then again grip and flip