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BrickMan
And also 30mm. What seems like a small difference becomes huge when the torsional stiffness is proportional to the 4th power of diameter. 30mm aluminium alloy axles are fine, 24mm ones are a terrible idea. For a given load, the stress is reduced by about 60% using the larger axle. In the relevant region of the curve for 7075T6, that can easily be two orders of magnitude greater fatigue life.