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-   -   The Physics of Rollers (https://www.bikeforums.net/road-cycling/533575-physics-rollers.html)

Phantoj 04-23-09 07:02 AM
Originally Posted by jccaclimber (Post 8782763)
And I stayed in a Holiday Inn a couple weeks ago. Interestingly, I feel that leaves me qualified to say that you're incorrect, especially as lean would change nearly nothing if you welded the headset strait (I'm also a year into a master's thesis on this topic).
Are you saying that Fajens and the articles on his site are incorrect? Will you provide a link to your thesis when you publish?

Grumpy McTrumpy 04-23-09 07:06 AM
there are two types of bicycle riders

those who countersteer and know it

those who countersteer and don't think they are doing it

jccaclimber 04-23-09 12:16 PM
Originally Posted by Tulex (Post 8783276)
Point being, they don't turn for balance.
They do both turn and lean for balance. It's done at a very low speed so turning mixed with leaning causes a lateral shift in your CG.

jccaclimber 04-23-09 12:39 PM
Originally Posted by Phantoj (Post 8784595)
Are you saying that Fajens and the articles on his site are incorrect? Will you provide a link to your thesis when you publish?
I suppose I can link my thesis if I can remember. I believe that Fajans is correct, what I disagree with is the conclusions of AngryScientist from those papers. Comments like the one about riding a bike with a welded headset are incorrect. Saying that you can ride without hands is very different from saying that you can ride with a welded headset. Without your hands your front wheel is still rotating a bit, even if it isn't your hands causing the rotation.


If you want to get a good primer on stability find either the work of Dr. Jim Papadopoulos (Cornell) (http://ruina.tam.cornell.edu/researc..._and_links.htm) (note, VERY DENSE) or Chronicles of the Lords of the Chain Ring (Dr. William Patterson, CalPoly SLO).

jack002 04-23-09 12:52 PM
Comments like the one about riding a bike with a welded headset are incorrect

+1. Hogwash and off topic to boot.

Phantoj 04-23-09 12:57 PM
Originally Posted by jccaclimber (Post 8786990)
They do both turn and lean for balance. It's done at a very low speed so turning mixed with leaning causes a lateral shift in your CG.
I saw a bicycle tightrope rider on youtube. He had a really long 40 pound pole for balance. So I think he was mostly balancing himself and the bike with the pole.

Phantoj 04-23-09 01:00 PM
Originally Posted by jccaclimber (Post 8787168)
what I disagree with is the conclusions of AngryScientist from those papers. Comments like the one about riding a bike with a welded headset are incorrect.
I think you misinterpreted his post (#11). I think he read up on Fajan's site and it changed his mind.


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