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I didn’t realise that it was a common occurrence.
Probably a combination of things,
1 - usage being outwith design. They have a rep as being a burly crank, maybe their aesthetic design and premium price point are causing a false inflation of this? They probably appeal to the kind of rider that’ll give them a hard life?
2 - maybe there’s something about the thread that makes them particularly susceptible to damage in that area. I’m sure mine came with a set of pedal washers, not every crankset does.
Well yeah, but then is it design fault, production fault, user error? Given there seems to be a lot of them - are these super common cranks and it's just normal numbers? Are they all faulty and this should be a recall situation? Is it a certain year/model that's failing more often? All that good stuff.