Cracks in carbon bar

[BdaGhisallo]

Originally Posted by Mark McM

Insert a wedge between the steerer and one of the vice faces to apply a concentrated point load on the steerer. You might find a different result. Carbon if very strong - when loads are well distributed across the fibers. But it is also brittle and doesn't like high point loading. The steerer failures we hear about typically occur where the edges of stems or compression rings cause high point loading. Metal is often more tolerant of high point loading, and will yield before fracturing.

I'll try that next time I have a bit of steerer tube cutoff laying around.

Cheers.