I did not know this, but according to what I was just reading, pretty much any physical material must rupture when it spins close to the speed of sound in that

I did not know this, but according to what I was just reading, pretty much any physical material must rupture when it spins close to the speed of sound in that material. If you imagine a relativistic spinning disk anyway, then it gets interesting because due to length contraction, the circumference changes relative to the diameter. I'm not up to the math, but it seems like it might change the effective gear ratio depending on your perspective and the closeness of the speed to C. https://en.wikipedia.org/wiki/Ehrenfest_paradox https://en.wikipedia.org/wiki/Ehrenfest_paradox