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
Torsion is a twisting motion, imagine grabbing each end of a rod in your hands and twisting them in opposite directions. If you have something where the torsion is oscillating it will be twisting one way and then twisting the other way. The torsional vibration frequency is the the frequency of this oscillation between twisting directions.
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