Weirdo physics have been a part of BMX bicycle operation in Grand Theft Auto V since its release, but in Grand Theft Auto Online it's taken on a new dimension lately.
Not only do you soar in moon gravity off Mt. Chiliad, you can even ascend, as this video—one of dozens uploaded over the past four days to YouTube—illustrates.
Basically, you have to ramp the bike off a very, very high point and then lean all the way back. You then "fly" the bike, not necessarily like parachuting but sort of like a plane without the tail. As you can see in this video, this glide isn't even the longest among the three guys who were playing together.
GTA V Online My Best and Longest BMX Flight! [Doctor Typ0 on YouTube]