All the guys that show up on big, heavy downhill bikes...

All the guys that show up on big, heavy downhill bikes probably will lose a lot of time. Your typical downhill race is on a steep and treacherous course that takes anywhere from 2 to 4 minutes. Super Downhill is a lot more fitness-based. These races are 10 to 25 minutes long. Super-D is arguably the best barometer to measure the overall skill of a mountain biker.