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Nev wrote:
Where exactly does the rider factor come in?

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True story: Neighbor borrows my old steel frame and finds that it wobbles severely at 40+ mph. I observe him almost going down as tank slappers begin on a steep downhill. Never having experienced this myself in a decade plus of riding that bike, I take the bike back and test ride. Approaching 50 mph, the bike is as stable as ever - no problems whatsoever.

Moral: The rider definitely influences wobble. Some bikes may have geometry problems that make wobble more likely but even the most stable bike can be ridden badly.

Postscript: My Calfee tracks perfectly at all speeds.

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