Agreed, longer hubs will make the rear axle flex less granted that the innermost part of the hubs are mounted further inwards on the axle than the shorter hubs (i.e. not just increasing the track). The longest ones (148mm) from OTK are insanely expensive though.
It is very interesting to read that the harder axles, given the same outside and inside diameters as softer axles, doesn't make much of a difference, if any. I understand the part about Young's Modulus, and it would have been great if I had some software available to model the rear axle and put some loads on it to see the amount of flex with a higher/lower Young's Modulus.
I've been promised an action picture showing the difference between softer and harder axles, which I will post a link to if I receive it.
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