A plucky team of four-wheelers attempt to take on the ultimate downhill world record. Watch When Calvin Williams fell almost 20m off a cliff in 2004, he could have had no idea what it would lead him ...

When Calvin Williams fell almost 20m off a cliff in 2004, he could have had no idea what it would lead him to achieve. Confined to a wheelchair for a time, he missed mountain biking and decided to do ...