A bicycle in zero gravity is unrideable (The bricycle).

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I E : Does this assume a spherical bricycle in a vacuum?

Murgatroyd13 : Interesting zero-G simulation - but not "real life" since any bike or trike being ridden in a zero-G environment would soon find itself floating above the surface after the first surface irregularity....  One could keep it on the surface by having the surface curve up, even keeping on rising until it had curved over to meet itself again, when centripetal force would ensure contact (as long as it keeps moving) - but it would then become steerable again, since (as Einstein pointed out) gravitational attraction and acceleration are equivalent.

iamnotfernando : I don't know about the zero gravity gobblygook but experiment can't be complete without practice. Muscle memory from riding a bike is so engrained that changing the handling of a bike will make it unrideable..at first.

eschelar : Not only is it an 'uncontrollable' bicycle, it's also a wheeled vehicle that can be forced to travel in a straight line. That could be a useful tool for some

omegalazarus : What confuses me is that the lean of a bicycle in a turn (when countersteering)  is not based on the rider or any external forces, but on the mechanical constraints of the bike. The rake and trail create a situation where the turning of the front wheel describes a circle tangentially connected the ground that must lower the bike to stay in contact as the arc naturally takes the contact point away from the surface by its arc. So, a stationary bike with or without rider, when the handlebars are turned, will lean it self. This is because the act of turning moves the front contact patch out of alignment with the rear contact patch and lowers the front of the bike. The simultaneous lowering of the front and moving (left or right) of the front is combined as 'lean.' This effect is independent of gravity as it can still be seen in your bike when the springs are set to null gravity. It seems then, that countersteering in a null gravity (or always balanced) environment would still work since balance is sustained by forward motion after about 5mi/hr.   Is this not correct in some way? does your experiment hold at speeds where countersteering would normally be the sole method of turning?

Larry Lem : Wonderful experiment!

Jayram A. Déshpandé : fantastic explanation ! Thanks.

Anton Johansson : Please wear a helmet :)

JinXiOne : wow your voice is like 1blue3brown

Dan Frederiksen : Eh first, the title is wildly wrong since this has nothing to do with zero gravity. And second, the last configuration is easily steerable. Slow down a bit and lean your body into the turn. Come on people. ET is waiting for us to wake up and realize we are not alone, we can't be tripped by simple things like this.

IIAOPSW : this must be mike pences bicycle. it only goes straight.

william mclaughlin : 1:43 If the bike steers in the opposite direction of its intended course then what would happen if the bicycle was directed in the opposing direction of its intended course?

Chad Reitsma : I tried bicycling in space once, so I can confirm this is 100% NOT a complete waste of everyone's time.

Calvin Hulburt : Thanks for the great evidence for the explanation I give in Bicycle Stability 101. Of course, if you transfer the weight to the outriggers, you will eliminate the lateral forces at the bicycle tires and control as well. The TMS gadget proved that a bicycle stays upright because of the contention of camber and slip angle forces and now this. Thank you.

Yotam p : How about pushing with a stick to counter using one hand?

Airiel Salvatore : anyone else leaning when watching this?

Blues251 : very neat!

C Smith : Very interesting.

Patamoteur : Hello, according to this principle would you be able to build a sytem to remove the gyroscopic couple on a paramotor?

Johan Larsson : That ending. Deep and clear at the same time.

adam1885282 : I must try this!

robertinventor : This led me to wonder: would you be able to go round corners on a cycle in artificial gravity? I mean like a torus type habitat spinning for artificial gravity? Does it depend on the radius, and spin rate, or can you cycle at any combination of those values?

Soraellion : A bicycle in zero gravity would not touch the surface with its tires, making this all moot.

Logeekistics : You can still steer if you go very slowly that you simply turn the handles to turn without leaning.