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A comment on The mysterious life of birds who never come down. Parent comment

Re:The mysterious life of birds who never come down by LargoLasskhyfv on Saturday August 01, 2020 @01:10PM (#24022093)
The shimmies! I've forgotten about them :-) Had them at 65. They were very unexpected when they happened the first time. And were gone at 67/68 again. I think they result from imbalances in the rims, due to the valves. And it varies with different frames-
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Re:The mysterious life of birds who never come down by phyzome on Sunday August 02, 2020 @10:19AM (#24028851)
It's actually part of how I know how fast I was going that one time. :-)

I was on a 45mph speed limit road and I was keeping up with the cars, but I wasn't sure if they were following the limit. But I was later able to tap at the same frequency while looking at a watch and discovered it was about 8 Hz, and then took the outer circumference of my tire and calculated that it was about 45 mph as well assuming that an imbalance in the wheel or tire was the source.

(My video camera had also caught some mile markers, but my speed varied in between, so those were only corroborative.)

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