JXN1

@ShawMac: Yep, meant the first clip. In the second clip, dude was dragging his brakes down the steep roll and encountered the baby head rocks at the bottom that are likely dusty and glass off. The front tire slides on these rocks then gets immediate traction on the dirt just past them. The riders full weight goes forward (you can see his heels come up meaning there is no weight on his pedals / rear wheel) and he packs into the bars. You can hear his fork fully compress and then see his front wheel turn until it is perpendicular to his direction of travel. This is the best moment of traction my man will ever get from a tire in his life! The jacknifed front wheel stops immediately and the whole shabangabang flips end over end like a goddam cartoon.

@Compositepro: Bike Porn. Literally.

When you go off of a drop at slow speed, the front wheel drops off the lip while the rear wheel is still on flat ground. In effect, the lip of the drop has now become a triangular obstacle in front of the rear wheel. Since the front wheel is in free fall and the rear wheel now meets resistance, bike and rider rotate forward. When the rotation is even faster than in this clip (and in some clips it is beyond belief how fast the rider goes ass over tea kettle), the rider is likely dragging their rear brake which compounds the problem. The rider in this clip should have moved forward slightly and then shifted weight rearward as the front wheel left the lip. This suspends the front tire momentarily so that the rear tire encounters less resistance. As rider speed increases, less and less weight shift is necessary to momentarily suspend the front wheel. At high speeds, you won't need any weight shift.

@lunitare: (distant tumbling)

Viking style.

Scandi Wrong for sure

Unicycling: Why?

Wouldn't it be inseam? Such a gross name for a measurement, but that's the limiting factor for clearance over your rear wheel.

@justinfoil: You see this a couple times a week on Friday Fails. It looks like the rider locks up their rear brake out of fear, but it's actually an unfortunate butt buzz with enough force to stop the rear wheel dead. The bigger the forces, the more extreme the OTB result. Mullet setups mitigate this danger.

Unknown. Possibly unknowable.