Join Date: Sep 2007
Location: Dallas area, Texas
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It's a point-proving thing.
It's not obvious, but certain curves can be a constant width without being round. As those wheels roll, the centers of the wheels should move up and down some. But the bike is supported off the tops of the wheels, not off the centers, so the bike rides level.
One of my Martin Gardiner (Gardner?) books has a chapter on curves of constant width.
"be careful this rando stuff is addictive and dan's the 'pusher'."