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This kind of failure is due to fatigue so has very little to do with the amount of force applied to the pedals. In fact, those big sprinters with massive legs do not fatigue their cranks. It is the long miles that cause this.
waterlaz-
Presumably the same would apply to steel though.
Or put another way "If alu worked for all the pro cyclists in the world I think they're fine for the rest of us."
Because all those shimano groupsets with their alu cranks have been doing 30,000km a year under dudes from Lance to loopy local audaxer. Alu as a crank material is clearly fine.
hippy
If alu works for all the track sprinters in the world I think they're fine for the rest of us.