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I'm really curious how much torque it takes to break a carbon steer tube.
I destroyed a CF frame 5 years ago hitting it into a low hanging garage.
Steer Tube was probably close to 100x the thickness/strength of some parts of the frame. It was completely unscathed from the impact.
Meanwhile AFAICT there is nothing you ever torque more than 5Nm on a carbon steer tube.
So what's the spread between 5Nm and cracking 3-4mm thick solid carbon?
I don't think the torque wrench could possibly be responsible for that breakage. Even if the wrench was broken the effort should have been off the scale compared to what is reasonable for torquing a stem since the normal effort would be something you would do with a teeny little Allen wrench that would bend in your hand and you'd probably be torquing away with a big torque wrench as if you were tightening a lug nut on a car.
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