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Shows there is quite some difference between drive side and non drive side deflection, implying there is noticeable flex in the spindle, right?
Measurable is not the same as noticeable. Changes in neutrino flows are measurable. They are not noticeable.
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there is quite some difference between drive side and non drive side deflection, implying there is noticeable flex in the spindle, right?
There's a lot of difference between left and right cranks besides the tube joining them together in the middle. If you want to know how much the spindle winds up when driven by the left crank, you need to measure the spindle wind up, not the total deflection of everything in the load path from chain to pedal bearing.
I've been trying to help, but you don't seem to be taking the hint. Steel is about 2.5 times as stiff as aluminium. A 24mm tube with 2.5mm walls (HT2, pilot bore for M20×1.0 bolt) is about 0.4 times as stiff as 30mm tube with 3.5mm walls (BB30, pilot bore for M24×1.0 bolt) if the material stays the same. I think you can see where this is going (0.4×2.5=?)
The advantage of aluminium 30mm over 24mm steel isn't that it's stiffer, it's that its about 60% of the mass and uses bigger bearings.
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Brommers
gbj_tester
@Jaap
Interesting stuff
http://blog.fairwheelbikes.com/reviews-and-testing/road-bike-crank-testing/
Shows there is quite some difference between drive side and non drive side deflection, implying there is noticeable flex in the spindle, right? Especially since the difference on 24mm spindle cranksets is bigger.