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I've seen a lot more cranks come off from under tightening than I've seen issues from over tightening
I also have issues when people ham fisted it to oblivion without a torque wrench and end up causing the bolt to be rounded.
14Nm is the max, but at least no customer return with a loose crank with the exception of an older cockier freelancer whom almost fucked yo a customer bike going down Hardknott.
edscoble
I think they have the tiniest amount of Shimano's fun coloured grease on. Maybe it's Shimano being typically over cautious, but probably warranted, I've seen a lot more cranks come off from under tightening than I've seen issues from over tightening, the bolts have quite shallow hex recesses so can get rounded, but it's also difficult to over do them without the key trying to slip out.