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Carabo-
Going by the uneven colouration on the crack surface the crack might have started a while ago.
I have no idea how quickly the aluminium dulls like that but it doesn't really matter, they shouldn't be cracking.
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That looks like anodising rather than dulling, which, if that was the case, would mean the crack was there when those cranks were manufactured…
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The uneven colouration is the result of foot rubbing.
Unless there is an impact these cranks should last a long time.
A stress fracture may not be readily apparent after an impact.
If components aren't kept clean:- there is less of an imperative to look after it
- difficult to do visual and safety inspections.
- there is less of an imperative to look after it
M_V
Dogtemple
iC
Miche Pistard 2.0