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Old 11-17-25 | 04:39 PM
  #107  
tomato coupe
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Bikes: Colnago, Van Dessel, Factor, Cervelo, Ritchey

Originally Posted by wheelreason
The only way a pedal top travels a circle is if the pedal spindle does not spin at all.
This is incorrect. The pedal top also travels in a circle if the orientation of the pedal (in space) is constant.

Another good example of this is a Ferris wheel. The cars of a Ferris wheel have a fixed orientation in space (because gravity causes them to hang directly below their mounting points located on the main wheel) and they trace a circular path through space as the Ferris wheel rotates. The circular path of the cars is not centered on the hub of the main wheel, but on a point that "hangs" several feet beneath the hub of the main wheel. The fact that the cars don't remain at a constant distance from the hub of the main wheel isn't relevant -- the path of the cars is still circular.
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