I read this [article](https://www.cycleworld.com/story/bikes/controlling-crankshaft-vibration/) like four times and I swear I know less now
In: Physics
Look up the Tacoma narrows bridge disaster. The bridge was made of concrete and steel and cables, but overall it behaved like a “ribbon”, twisting left and right in the winds. After all, it was just suspended by a bunch of cables. It just so happened that the frequency of winds over the water was roughly the same as this twisting (aka torsional) frequency. So even tiny twisting motions were amplified by the winds and the whole bridge twisted so much that cables snapped and the whole thing fell.
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