Do you remember when that kid at summer camp dared you to ride a bike off of the end of the fishing pier? In Wuhan, Hubei Province, China, they’re apparently calling this a “festival” and using it to raise awareness of environmental issues.
If you decide to try this at home, be sure to use a junk bike because water will damage the moving parts. Attach flotation to the bike frame so you can more easily retrieve your bike from the bottom of the pond. In the United States, polyethylene foam swimming pool noodles wrapped around the frame are a popular form of flotation.
Now I wonder: do fat tires provide enough buoyancy to keep fat-tire bikes afloat in water? If a cheap, discount retail fatbike weighs 50 lbs, what volume of air in a tire is required to displace that weight?