Flexural stiffness, when you put your weight on one pedal, to see how much the axle would bend downwards.
Torsional stiffness, when you put your weight on one pedal, to see how much the axle rotates clockwise.
With carbon fibre being what it is, it has very different stiffnesses in different directions. So for something like an axle (which experiences multiple loading directions), it does not make too much sense to have it out of something like carbon. Something like Ti is much better as it has good flexural stiffness and torsional stiffness. Its also much less brittle than carbon.
haha, nobody wins...
We were looking at different stiffnesses.
Flexural stiffness, when you put your weight on one pedal, to see how much the axle would bend downwards.
Torsional stiffness, when you put your weight on one pedal, to see how much the axle rotates clockwise.
With carbon fibre being what it is, it has very different stiffnesses in different directions. So for something like an axle (which experiences multiple loading directions), it does not make too much sense to have it out of something like carbon. Something like Ti is much better as it has good flexural stiffness and torsional stiffness. Its also much less brittle than carbon.