How bikes work

Anything you like about motorbikes
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weeksy
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Re: How bikes work

Post by weeksy »

porter_jamie wrote: Wed Dec 01, 2021 12:35 pm two wheeled vehicles steer like a car until a certain speed is reached then it goes the opposite way. prodrive did some work to show this years ago.

it might be possible to ride a bike not understanding what 'countersteering' is, but it is completely impossible to ride a bike without doing it. Literally, as the video above proves. you might not think you are doing it, but you are.
I've not watched the video, but doesn't that depend how you interpret the phrase ? Surely if you pull on the bar (riding 1 handed) then that's sort of countersteering, but you're not pushing the inside bar, you''re pulling the outside one ?
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Re: How bikes work

Post by Skub »

Keith Code invented counter steering,don't you lot know nuttin'? :roll:
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Re: How bikes work

Post by slowsider »

Skub wrote: Wed Dec 01, 2021 12:59 pm Keith Code invented counter steering,don't you lot know nuttin'? :roll:
And it only cost him about a dollar's worth of attention ;)
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Re: How bikes work

Post by Skub »

slowsider wrote: Wed Dec 01, 2021 1:04 pm
Skub wrote: Wed Dec 01, 2021 12:59 pm Keith Code invented counter steering,don't you lot know nuttin'? :roll:
And it only cost him about a dollar's worth of attention ;)
The trouble is I only started with fifty cents. :cry:
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Re: How bikes work

Post by Count Steer »

weeksy wrote: Wed Dec 01, 2021 12:52 pm
porter_jamie wrote: Wed Dec 01, 2021 12:35 pm two wheeled vehicles steer like a car until a certain speed is reached then it goes the opposite way. prodrive did some work to show this years ago.

it might be possible to ride a bike not understanding what 'countersteering' is, but it is completely impossible to ride a bike without doing it. Literally, as the video above proves. you might not think you are doing it, but you are.
I've not watched the video, but doesn't that depend how you interpret the phrase ? Surely if you pull on the bar (riding 1 handed) then that's sort of countersteering, but you're not pushing the inside bar, you''re pulling the outside one ?
The push/pull thing is a bit of a sideshow really, you could ziptie a steering wheel to the bars and turn it whichever way and get the effect - unless you have Yorick's bike.
The gentle 'push' initiates the lean at which point the geometry turns the wheel in the direction of the turn. I managed to do it in a 10yd space at the side of our old house on my 1987 vintage MTB but I don't think that bikes have changed that much.
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Re: How bikes work

Post by Le_Fromage_Grande »

Count Steer wrote: Wed Dec 01, 2021 11:38 am
Mr. Dazzle wrote: Wed Dec 01, 2021 11:31 am
Count Steer wrote: Wed Dec 01, 2021 11:28 am

Ooh, from about 0.1mph. (It works on a bicycle as long as it's moving forwards).
What about backwards? :D

I saw the 2 year old baby D doing it on her little balance bike (push bike without pedals) at not much more than walking pace. For some reason best known to herself she used to like riding with just the heels of her hands resting on the bars and her fingers in fists, but she could still balance and steer just fine.
I tried riding a pushbike backwards once.

It didn't end well. :(
It's possible but difficult, but it's over 40 years since I did it.
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Re: How bikes work

Post by millemille »

weeksy wrote: Wed Dec 01, 2021 12:52 pm
porter_jamie wrote: Wed Dec 01, 2021 12:35 pm two wheeled vehicles steer like a car until a certain speed is reached then it goes the opposite way. prodrive did some work to show this years ago.

it might be possible to ride a bike not understanding what 'countersteering' is, but it is completely impossible to ride a bike without doing it. Literally, as the video above proves. you might not think you are doing it, but you are.
I've not watched the video, but doesn't that depend how you interpret the phrase ? Surely if you pull on the bar (riding 1 handed) then that's sort of countersteering, but you're not pushing the inside bar, you''re pulling the outside one ?
How you initiate the counter steer - pushing inside bar or pulling outside bar - is irrelevant, it's all counter steering.

Counter steering refers to the fact that the front wheel's steering axis is rotated in the opposite direction to the desired trajectory of the bike, "counter" and "steering", to initiate the change in trajectory.
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Re: How bikes work

Post by porter_jamie »

at very slow speed you steer a bike like a car. i cannot find the video but there was a guy who was the chassis dyanmics guy from prodrive and he made a 2 wheeled vehicle with a steering wheel and the computers sorted out the steering for you. it knew when to steer the 'right' way and the 'wrong'. pretty mental.
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Re: How bikes work

Post by Dodgy69 »

porter_jamie wrote: Wed Dec 01, 2021 1:28 pm at very slow speed you steer a bike like a car. i cannot find the video but there was a guy who was the chassis dyanmics guy from prodrive and he made a 2 wheeled vehicle with a steering wheel and the computers sorted out the steering for you. it knew when to steer the 'right' way and the 'wrong'. pretty mental.

The topple over point. 🙂
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Re: How bikes work

Post by slowsider »

Skub wrote: Wed Dec 01, 2021 1:07 pm
slowsider wrote: Wed Dec 01, 2021 1:04 pm
Skub wrote: Wed Dec 01, 2021 12:59 pm Keith Code invented counter steering,don't you lot know nuttin'? :roll:
And it only cost him about a dollar's worth of attention ;)
The trouble is I only started with fifty cents. :cry:
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Re: How bikes work

Post by Yorick »

porter_jamie wrote: Wed Dec 01, 2021 1:28 pm at very slow speed you steer a bike like a car. i cannot find the video but there was a guy who was the chassis dyanmics guy from prodrive and he made a 2 wheeled vehicle with a steering wheel and the computers sorted out the steering for you. it knew when to steer the 'right' way and the 'wrong'. pretty mental.
A quick Google shows it to start at about 20MPH.
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Re: How bikes work

Post by Count Steer »

porter_jamie wrote: Wed Dec 01, 2021 1:28 pm at very slow speed you steer a bike like a car. i cannot find the video but there was a guy who was the chassis dyanmics guy from prodrive and he made a 2 wheeled vehicle with a steering wheel and the computers sorted out the steering for you. it knew when to steer the 'right' way and the 'wrong'. pretty mental.
I looked for it but no success. There is a school of thought that it only works above a certain speed ie 20mph. Others say:

At low speeds countersteering is equally necessary, but the countersteering is then so subtle that it is hidden by the continuous corrections that are made in balancing the bike, often falling below a just noticeable difference or threshold of perception of the rider. Countersteering at low speed may be further concealed by the ensuing much larger steering angle possible in the direction of the turn.

I know I've done it at walking pace but hey ho the speed where it becomes 'real' is a bit 'how many angels can dance on a pin head'. At least we've reached a stage where most accept it exists and that it initiates the turn. :thumbup:
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Re: How bikes work

Post by Yorick »

Ooh. Look. The bike goes exactly where he points it.

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Re: How bikes work

Post by Count Steer »

Ooh. Look. The bike goes exactly where he points it.....after he's initiated the turn by countersteering.

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Re: How bikes work

Post by Horse »

Yorick wrote: Wed Dec 01, 2021 12:51 pm
porter_jamie wrote: Wed Dec 01, 2021 12:35 pm two wheeled vehicles steer like a car until a certain speed is reached then it goes the opposite way. prodrive did some work to show this years ago.

i
Not according to the experts above :crazy:
Try them, let us know how you get on. Get Penny to video it :)
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Re: How bikes work

Post by Demannu »

Skub wrote: Wed Dec 01, 2021 12:59 pm Keith Lemon invented counter steering,don't you lot know nuttin'? :roll:
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Re: How bikes work

Post by Le_Fromage_Grande »

Try counter steering at 170 mph, things will get interesting
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Re: How bikes work

Post by Yorick »

Le_Fromage_Grande wrote: Wed Dec 01, 2021 5:39 pm Try counter steering at 170 mph, things will get interesting
I've had to swerve round a few slower riders at that speed :)
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Re: How bikes work

Post by Rockburner »

weeksy wrote: Wed Dec 01, 2021 12:52 pm

I've not watched the video, but doesn't that depend how you interpret the phrase ? Surely if you pull on the bar (riding 1 handed) then that's sort of countersteering, but you're not pushing the inside bar, you''re pulling the outside one ?
That's 'contra-steering', totally different thing.
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Re: How bikes work

Post by Mr. Dazzle »

And not to be confused with "counter seering" either. Delicious results though.