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And maintaing the balance at those speeds. I can hardly control mine at 50 kmph downhill

> And maintaing the balance at those speeds. I can hardly control mine at 50 kmph downhill

Wouldn't balance actually be easier, due to the gyroscopic effect of how fast the wheels would be turning?

The gyroscopic effect is not what causes a bike to balance, it's the arrangement of centres of mass around the pivot or steering. It is harder to maintain that balance at high speeds since small adjustments to the steering produce much quicker responses.

https://ezramagazine.cornell.edu/SUMMER11/ResearchSpotlight....

That's highly inaccurate. The gyroscopic effect is not everything, but it does get stronger at higher speeds. That's why even a simple wheel without any frame or steering mechanism will run mostly stable at high speeds. So when going at high speeds on a bike, it indeed is more stable than when going slow.

The article you link only claims that the gyroscopic effect is not everything stabilizing a bike.

That's a problem with your posture and/or your bike's geometry (or just a loose headset), not an inherent problem of going 50 kmph

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