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not any appreciable degree.
Since we're comparing 24mm steel with 30mm aluminium, there's about 20% difference in torsional and bending stiffness for the same length spindle with the same ratio of OD to wall thickness. I leave it as an exercise for the reader to decide which is stiffer :)
gbj_tester-
Since we're comparing 24mm steel with 30mm aluminium, there's about 20% difference in torsional and bending stiffness for the same length spindle with the same ratio of OD to wall thickness
On 24mm steel spindles I can detect 0nm defection due to spindle flex. Whatever percentage it is, x% of nothing is still nothing.
Brommers
Did you do back to back testing with 24mm and 30mm spindle chainsets then? Struggling at present to see how the spindle diameter could affect anything other than crank stiffness, and even then not any appreciable degree.