this post was submitted on 17 Sep 2024
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[–] 0ops@lemm.ee 21 points 2 months ago* (last edited 2 months ago) (7 children)

I'm surprised how much I'm seeing gyro brought up in these comments. It's a factor, but it's practically negligible. It's all in the steering. Start to tip right, and you'll subconsciously steer slightly to the right to correct your balance. Try to ride as slow as you can and you'll find yourself doing these corrections much more frantically and dramatically. The reason for that is because it takes longer for the wheel to roll under your center gravity and "catch" you when you're going slowly so you have to turn in quicker to maintain balance.

Notice that on almost every bike you see, the front axle on the bike is slightly ahead of the neck's axis of rotation. That offset does two things: 1. It stabilizes the steering so that the bike will tend to steer straight and 2. (more important to my point) It makes the balance-correcting effect of steering more immediate and dramatic, making it much easier to ride at slower speeds.

As a counter argument showing why gyro is barely a factor, these exist: image of a ski bike

Edit: if you're not seeing the image like I'm not, Google "ski bike".

[–] malle_yeno@pawb.social 3 points 2 months ago (2 children)

I figured it was pretty obviously the rider that's making the bike not fall over, not the bike itself.

If the bike's ability to remain upright while moving was a natural feature, then why would you ever need to learn how to ride bikes? You could just sit on it and go if that was the case.

[–] frezik@midwest.social 4 points 2 months ago (1 children)

It works on its own. If you push your bike along with a good run and then let go, it'll stay upright until it slows down too much.

Learning to ride a bike is mostly about being confident enough to let the bike work itself out. It gets more stable as it goes faster, but it's natural to be afraid to go faster when it already feels unstable at low speed. Then there's a little bit to learn about countersteering, but most people figure that out without being told it's even a thing.

[–] boonhet@lemm.ee 2 points 2 months ago

Yeah. Case in point: Ghost riders in Motorcycle racing.

Motorcycles also tend to fall down when stationary, yet stay upright without the rider at speed.

Also makes me wonder if just the bike crossing the finish line would be enough to win if you fell off in first place just before the line.

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